    REALNETWORKS COMMUNITY SOURCE LICENSE

    (RCSL)

Version 1.0 (Rev. Date October 28, 2002).


  RECITALS

Original Contributor has developed Specifications, Source Code 
implementations and Executables of certain Technology; and

Original Contributor desires to license the Technology to a large 
community to facilitate research, innovation and product development 
while maintaining compatibility of such products with the Technology as 
delivered by Original Contributor; and

Original Contributor desires to license certain Trademarks for the 
purpose of branding products that are compatible with the relevant 
Technology delivered by Original Contributor; and

You desire to license the Technology and possibly certain Trademarks 
from Original Contributor on the terms and conditions specified in this 
License.

In consideration for the mutual covenants contained herein, You and 
Original Contributor agree as follows:


  AGREEMENT

*1. Introduction.*

The RealNetworks Community Source License ("RCSL") and effective 
attachments ("License") may include six distinct licenses:

i. Research Use license - License plus Attachments A, B and C only.

ii. Commercial Use License, which may be for Internal Deployment Use or
external distribution, or both -- License plus Attachments A, B, C, D and E.

iii. Technology Compatibility Kit (TCK) license - Attachment C.

iv. Trademark license - Attachment E.

v. RealAudio/RealVideo Technology License (Executable) Client
Distribution License -Attachment F.

vi) RealAudio/RealVideo Technology Source Code Porting 
License -Attachment G.

The Research Use license is effective when You click and accept this 
License. The TCK is effective when You click and accept this License, 
unless otherwise specified in the TCK attachments. The Commercial Use, 
Trademark, RealAudio/RealVideo Technology Licenses, and the 
RealAudio/RealVideo Source Code Porting licenses must each be signed by 
You and Original Contributor to become effective. Once effective, these 
licenses and the associated requirements and responsibilities are 
cumulative. Capitalized terms used in this License are defined in the 
Glossary. 

*2. License Grants.*

2.1 Original Contributor Grant.

Subject to Your compliance with Sections 3, 8.10 and Attachment A of 
this License, Original Contributor grants to You a worldwide, 
royalty-free, non-exclusive license, to the extent of Original 
Contributor's Intellectual Property Rights covering the Original Code, 
Upgraded Code and Specifications, to do the following:

(a) Research Use License:

(i) use, reproduce and modify the Original Code, Upgraded Code and 
Specifications to create Modifications and Reformatted Specifications 
for Research Use by You;

(ii) publish and display Original Code, Upgraded Code and Specifications 
with, or as part of Modifications, as permitted under Section 3.1(b) 
below;

(iii) reproduce and distribute copies of Original Code and Upgraded Code 
to Licensees and students for Research Use by You;

(iv) compile, reproduce and distribute Original Code and Upgraded Code 
in Executable form, and Reformatted Specifications to anyone for 
Research Use by You.

(b) Other than the licenses expressly granted in this License, Original 
Contributor retains all right, title, and interest in Original Code and 
Upgraded Code and Specifications.

2.2 Your Grants.

(a) To Other Licensees. You hereby grant to each Licensee a license to 
Your Error Corrections and Shared Modifications, of the same scope and 
extent as Original Contributor's licenses under Section 2.1 a) above 
relative to Research Use and Attachment D relative to Commercial Use.

(b) To Original Contributor. You hereby grant to Original Contributor a 
worldwide, royalty-free, non-exclusive, perpetual and irrevocable 
license, to the extent of Your Intellectual Property Rights covering 
Your Error Corrections, Shared Modifications and Reformatted 
Specifications, to use, reproduce, modify, display and distribute Your 
Error Corrections, Shared Modifications and Reformatted Specifications, 
in any form, including the right to sublicense such rights through 
multiple tiers of distribution.

(c) Other than the licenses expressly granted in Sections 2.2(a) and (b) 
above, and the restrictions set forth in Section 3.1(d)(iv) below, You 
retain all right, title, and interest in Your Error Corrections, Shared 
Modifications and Reformatted Specifications.

2.3 Contributor Modifications.

You may use, reproduce, modify, display and distribute Contributor Error 
Corrections, Shared Modifications and Reformatted Specifications, 
obtained by You under this License, to the same scope and extent as with 
Original Code, Upgraded Code and Specifications.

2.4 Subcontracting.

You may deliver the Source Code of Covered Code to other Licensees 
having at least a Research Use license, for the sole purpose of 
furnishing development services to You in connection with Your rights 
granted in this License. All such Licensees must execute appropriate 
documents with respect to such work consistent with the terms of this 
License, and acknowledging their work-made-for-hire status or assigning 
exclusive right to the work product and associated Intellectual Property 
Rights to You.

*3. Requirements and Responsibilities.*

3.1 Research Use License.

As a condition of exercising the rights granted under Section 2.1(a) 
above, You agree to comply with the following:

(a) Your Contribution to the Community. All Error Corrections and Shared 
Modifications which You create or contribute to are automatically 
subject to the licenses granted under Section 2.2 above. You are 
encouraged to license all of Your other Modifications under Section 2.2 
as Shared Modifications, but are not required to do so. You agree to 
notify Original Contributor of any errors in the Specification.

(b) Source Code Availability. You agree to provide all Your Error 
Corrections to Original Contributor as soon as reasonably practicable 
and, in any event, prior to Internal Deployment Use or Commercial Use, 
if applicable. Original Contributor may, at its discretion, post Source 
Code for Your Error Corrections and Shared Modifications on the 
Community Webserver. You may also post Error Corrections and Shared 
Modifications on a web-server of Your choice; provided, that You must 
take reasonable precautions to ensure that only Licensees have access to 
such Error Corrections and Shared Modifications. Such precautions shall 
include, without limitation, a password protection scheme limited to 
Licensees and a click-on, download certification of Licensee status 
required of those attempting to download from the server. An example of 
an acceptable certification is attached as Attachment A-2.

(c) Notices. All Error Corrections and Shared Modifications You create 
or contribute to must include a file documenting the additions and 
changes You made and the date of such additions and changes. You must 
also include the notice set forth in Attachment A-1 in the file header. 
If it is not possible to put the notice in a particular Source Code file 
due to its structure, then You must include the notice in a location 
(such as a relevant directory file), where a recipient would be most 
likely to look for such a notice.

(d) Redistribution.

(i) Source. Covered Code may be distributed in Source Code form only to 
another Licensee (except for students as provided below). You may not 
offer or impose any terms on any Covered Code that alter the rights, 
requirements, or responsibilities of such Licensee. You may distribute 
Covered Code to students for use in connection with their course work 
and research projects undertaken at accredited educational institutions. 
Such students need not be Licensees, but must be given a copy of the 
notice set forth in Attachment A-3 and such notice must also be included 
in a file header or prominent location in the Source Code made available 
to such students.

(ii) Executable. You may distribute Executable version(s) of Covered 
Code to Licensees and other third parties only for the purpose of 
evaluation and comment in connection with Research Use by You and under 
a license of Your choice, but which limits use of such Executable 
version(s) of Covered Code only to that purpose.

(iii) Modified Class, Interface and Package Naming. In connection with 
Research Use by You only, You may use Original Contributor's class, 
Interface and package names only to accurately reference or invoke the 
Source Code files You modify. Original Contributor grants to You a 
limited license to the extent necessary for such purposes.

(iv) You expressly agree that any distribution, in whole or in part, of 
Modifications developed by You shall only be done pursuant to the terms 
and conditions of this License.

(e) Extensions.

(i) Covered Code. You may not include any Source Code of Community Code 
in any Extensions. You may include the compiled Header Files of 
Community Code in an Extension provided that your use of the Covered 
Code, including Heading Files, complies with the Commercial Use License, 
the TCK and all other terms of this License.

(ii) Publication. No later than the date on which You first distribute 
such Extension for Commercial Use, You must publish to the industry, on 
a non-confidential basis and free of all copyright restrictions with 
respect to reproduction and use, an accurate and current specification 
for any Extension. In addition, You must make available an appropriate 
test suite, pursuant to the same rights as the specification, 
sufficiently detailed to allow any third party reasonably skilled in the 
technology to produce implementations of the Extension compatible with 
the specification. Such test suites must be made available as soon as 
reasonably practicable but, in no event, later than ninety (90) days 
after Your first Commercial Use of the Extension. You must use 
reasonable efforts to promptly clarify and correct the specification and 
the test suite upon written request by Original Contributor.

(iii) Open. You agree to refrain from enforcing any Intellectual 
Property Rights You may have covering any interface(s) of Your 
Extension, which would prevent the implementation of such interface(s) 
by Original Contributor or any Licensee. This obligation does not 
prevent You from enforcing any Intellectual Property Right You have that 
would otherwise be infringed by an implementation of Your Extension.

(iv) Interface Modifications and Naming. You may not modify or add to 
the GUID space "xxxxxxxx-0901-11d1-8B06-00A024406D59" or any other GUID 
space designated by Original Contributor. You may not modify any 
Interface prefix provided with the Covered Code or any other prefix 
designated by Original Contributor.

(f) You agree that any Specifications provided to You by Original 
Contributor are confidential and proprietary information of Original 
Contributor. You must maintain the confidentiality of the Specifications 
and may not disclose them to any third party without Original 
Contributor's prior written consent. You may only use the Specifications 
under the terms of this License and only for the purpose of implementing 
the terms of this License with respect to Covered Code. You agree not 
use, copy or distribute any such Specifications except as provided in 
writing by Original Contributor.

*4. Versions of the License.*

4.1 License Versions.

Original Contributor may publish revised versions of the License from 
time to time. Each version will be given a distinguishing version 
number.

4.2 Effect.

Once a particular version of Covered Code has been provided under a 
version of the License, You may always continue to use such Covered Code 
under the terms of that version of the License. You may also choose to 
use such Covered Code under the terms of any subsequent version of the 
License. No one other than Original Contributor has the right to 
promulgate License versions.

4.3 Multiple-Licensed Code.

Original Contributor may designate portions of the Covered Code as 
.Multiple-Licensed.. .Multiple-Licensed. means that the Original 
Contributor permits you to utilize those designated portions of the 
Covered Code under Your choice of this License or the alternative 
license(s), if any, specified by the Original Contributor in an 
Attachment to this License.

*5. Disclaimer of Warranty.*

5.1 COVERED CODE PROVIDED AS IS.

COVERED CODE IS PROVIDED UNDER THIS LICENSE "AS IS," WITHOUT WARRANTY OF 
ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, 
WARRANTIES THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT 
FOR A PARTICULAR PURPOSE OR NON-INFRINGING. YOU AGREE TO BEAR THE ENTIRE 
RISK IN CONNECTION WITH YOUR USE AND DISTRIBUTION OF COVERED CODE UNDER 
THIS LICENSE. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART 
OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER 
EXCEPT SUBJECT TO THIS DISCLAIMER.

5.2 Not Designed for High Risk Activities.

You acknowledge that Original Code, Upgraded Code and Specifications are 
not designed or intended for use in high risk activities including, but 
not limited to: (i) on-line control of aircraft, air traffic, aircraft 
navigation or aircraft communications; or (ii) in the design, 
construction, operation or maintenance of any nuclear facility. Original 
Contributor disclaims any express or implied warranty of fitness for 
such uses.

*6. Termination.*

6.1 By You.

You may terminate this Research Use license at anytime by providing 
written notice to Original Contributor.

6.2 By Original Contributor.

This License and the rights granted hereunder will terminate:

(i) automatically if You fail to comply with the terms of this License 
and fail to cure such breach within 30 days of receipt of written notice 
of the breach;

(ii) immediately in the event of circumstances specified in Sections 7.1 
and 8.4; or

(iii) at Original Contributor's discretion upon any action initiated by 
You (including by cross-claim or counter claim) alleging that use or 
distribution by Original Contributor or any Licensee, of Original Code, 
Upgraded Code, Error Corrections, Shared Modifications or Specifications 
infringe a patent owned or controlled by You.

6.3 Effective of Termination.

Upon termination, You agree to discontinue use of and destroy all copies 
of Covered Code in your possession. All sublicenses to the Covered Code 
which you have properly granted shall survive any termination of this 
License. Provisions that, by their nature, should remain in effect 
beyond the termination of this License shall survive including, without 
limitation, Sections 2.2, 3, 5, 7 and 8.

6.4 No Compensation.

Each party waives and releases the other from any claim to compensation 
or indemnity for permitted or lawful termination of the business 
relationship established by this License.

*7. Liability.*

7.1 Infringement. Should any of the Original Code, Upgraded Code, TCK or 
Specifications ("Materials") become the subject of a claim of 
infringement, Original Contributor may, at its sole option, (i) attempt 
to procure the rights necessary for You to continue using the Materials, 
(ii) modify the Materials so that they are no longer infringing, or 
(iii) terminate Your right to use the Materials, immediately upon 
written notice, and refund to You the amount, if any, having then 
actually been paid by You to Original Contributor for the Original Code, 
Upgraded Code and TCK, depreciated on a straight line, five year basis.

7.2 LIMITATION OF LIABILITY. TO THE FULL EXTENT ALLOWED BY APPLICABLE 
LAW, ORIGINAL CONTRIBUTOR'S LIABILITY TO YOU FOR CLAIMS RELATING TO THIS 
LICENSE, WHETHER FOR BREACH OR IN TORT, SHALL BE LIMITED TO ONE HUNDRED 
PERCENT (100%) OF THE AMOUNT HAVING THEN ACTUALLY BEEN PAID BY YOU TO 
ORIGINAL CONTRIBUTOR FOR ALL COPIES LICENSED HEREUNDER OF THE PARTICULAR 
ITEMS GIVING RISE TO SUCH CLAIM, IF ANY, DURING THE TWELVE MONTHS 
PRECEDING THE CLAIMED BREACH. IN NO EVENT WILL YOU (RELATIVE TO YOUR 
SHARED MODIFICATIONS OR ERROR CORRECTIONS) OR ORIGINAL CONTRIBUTOR BE 
LIABLE FOR ANY INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL OR CONSEQUENTIAL 
DAMAGES IN CONNECTION WITH OR RISING OUT OF THIS LICENSE (INCLUDING, 
WITHOUT LIMITATION, LOSS OF PROFITS, USE, DATA, OR OTHER ECONOMIC 
ADVANTAGE), HOWEVER IT ARISES AND ON ANY THEORY OF LIABILITY, WHETHER IN 
AN ACTION FOR CONTRACT, STRICT LIABILITY OR TORT (INCLUDING NEGLIGENCE) 
OR OTHERWISE, WHETHER OR NOT YOU OR ORIGINAL CONTRIBUTOR HAS BEEN 
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND NOTWITHSTANDING THE 
FAILURE OF ESSENTIAL PURPOSE OF ANY REMEDY.

*8. Miscellaneous.*

8.1 Trademark.

You shall not use any Trademark unless You and Original Contributor 
execute a copy of the Trademark License Agreement attached hereto as 
Attachment F. Except as expressly provided in the License, You are 
granted no right, title or license to, or interest in, any Trademarks. 
Whether or not You and Original Contributor enter into the Trademark 
License, You agree not to (i) challenge Original Contributor's ownership 
or use of Trademarks; (ii) attempt to register any Trademarks, or any 
mark or logo substantially similar thereto; or (iii) incorporate any 
Trademarks into your own trademarks, product names, service marks, 
company names, or domain names.

8.2 Integration.

This License represents the complete agreement concerning the subject 
matter hereof.

8.3 Assignment.

Original Contributor may assign this License, and its rights and 
obligations hereunder, in its sole discretion. You may assign the 
Research Use portions of this License to a third party upon prior 
written notice to Original Contributor (which may be provided 
electronically via the Community Web-Server). You may not assign the 
Commercial Use license or TCK license, including by way of merger 
(regardless of whether You are the surviving entity) or acquisition, 
without Original Contributor's prior written consent.

8.4 Severability.

If any provision of this License is held to be unenforceable, such 
provision shall be reformed only to the extent necessary to make it 
enforceable. Notwithstanding the foregoing, if You are prohibited by law 
from fully and specifically complying with Sections 2.2 or 3, this 
License will immediately terminate and You must immediately discontinue 
any use of Covered Code.

8.5 Governing Law.

This License shall be governed by the laws of the United States and the 
State of Washington, as applied to contracts entered into and to be 
performed in Washington between Washington residents. The application of 
the United Nations Convention on Contracts for the International Sale of 
Goods is expressly excluded. You agree that the state and federal courts 
located in Seattle, Washington have exclusive jurisdiction over any 
claim relating to the License, including contract and tort claims.

8.6 Dispute Resolution.

a) Arbitration. Any dispute arising out of or relating to this License 
shall be finally settled by arbitration as set out herein, except that 
either party may bring any action, in a court of competent jurisdiction 
(which jurisdiction shall be exclusive), with respect to any dispute 
relating to such party's Intellectual Property Rights or with respect to 
Your compliance with the TCK license. Arbitration shall be administered: 
(i) by the American Arbitration Association (AAA), (ii) in accordance 
with the rules of the United Nations Commission on International Trade 
Law (UNCITRAL) (the "Rules") in effect at the time of arbitration as 
modified herein; and (iii) the arbitrator will apply the substantive 
laws of Washington and the United States. Judgment upon the award 
rendered by the arbitrator may be entered in any court having 
jurisdiction to enforce such award.

b) Arbitration language, venue and damages. All arbitration proceedings 
shall be conducted in English by a single arbitrator selected in 
accordance with the Rules, who must be fluent in English and be either a 
retired judge or practicing attorney having at least ten (10) years 
litigation experience and be reasonably familiar with the technology 
matters relative to the dispute. Unless otherwise agreed, arbitration 
venue shall be in Seattle, Washington. The arbitrator may award monetary 
damages only and nothing shall preclude either party from seeking 
provisional or emergency relief from a court of competent jurisdiction. 
The arbitrator shall have no authority to award damages in excess of 
those permitted in this License and any such award in excess is void. 
All awards will be payable in U.S. dollars and may include, for the 
prevailing party (i) pre-judgment award interest, (ii) reasonable 
attorneys' fees incurred in connection with the arbitration, and (iii) 
reasonable costs and expenses incurred in enforcing the award. The 
arbitrator will order each party to produce identified documents and 
respond to no more than twenty-five single question interrogatories.

8.7 Construction.

Any law or regulation, which provides that the language of a contract 
shall be construed against the drafter, shall not apply to this License.

8.8 U.S. Government End Users.

The Covered Code is a "commercial item," as that term is defined in 48 
C.F.R. 2.101 (Oct. 1995), consisting of "commercial computer software" 
and "commercial computer software documentation," as such terms are used 
in 48 C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and 
48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all U.S. Government 
End Users acquire Covered Code with only those rights set forth herein. 
You agree to pass this notice to our licensees.

8.9 Marketing Activities.

Licensee hereby grants Original Contributor a non-exclusive, 
non-transferable, limited license to use the Licensee's company name and 
logo ("Licensee Marks") in any presentations, press releases, or 
marketing materials solely for the purpose of identifying Licensee as a 
member of the Helix Community. Licensee shall provide samples of 
Licensee Marks to Original Contributor upon request by Original 
Contributor. Original Contributor acknowledges that the Licensee Marks 
are the trademarks of Licensee. Original Contributor shall not use the 
Licensee Marks in a way that may imply that Original Contributor is an 
agency or branch of Licensee. Original Contributor understands and 
agrees that the use of any Licensee Marks in connection with this 
Agreement shall not create any right, title or interest, in, or to the 
Licensee Marks or any Licensee trademarks and that all such use and 
goodwill associated with any such trademarks will inure to the benefit 
of Licensee. Further the Original Contributor will stop usage of the 
Licensee Marks upon Licensee's request.

   1. Press Announcements.

You agree not to make any press announcement or other public statement 
regarding this License without the prior written consent of the Original 
Contributor.

8.11 International Use.

a) Export/Import laws. Covered Code is subject to U.S. export control 
laws and may be subject to export or import regulations in other 
countries. Each party agrees to comply strictly with all such laws and 
regulations and acknowledges their responsibility to obtain such 
licenses to export, re-export, or import as may be required. You agree 
to pass these obligations to Your licensees.

b) Intellectual Property Protection. Due to limited intellectual 
property protection and enforcement in certain countries, You agree not 
to redistribute the Original Code, Upgraded Code, TCK and Specifications 
to any country on the list of restricted countries on the Community Web 
Server.

8.12 Language.

This License is in the English language only, which language shall be 
controlling in all respects, and all versions of this License in any 
other language shall be for accommodation only and shall not be binding 
on the parties to this License. All communications and notices made or 
given pursuant to this License, and all documentation and support to be 
provided, unless otherwise noted, shall be in the English language.

PLEASE READ THE TERMS OF THIS LICENSE CAREFULLY. BY CLICKING ON THE 
"ACCEPT" BUTTON BELOW YOU ARE ACCEPTING AND AGREEING TO THE TERMS AND 
CONDITIONS OF THIS LICENSE WITH REALNETWORKS, INC. IF YOU ARE AGREEING 
TO THIS LICENSE ON BEHALF OF A COMPANY, YOU REPRESENT THAT YOU ARE 
AUTHORIZED TO BIND THE COMPANY TO SUCH A LICENSE. WHETHER YOU ARE ACTING 
ON YOUR OWN BEHALF, OR REPRESENTING A COMPANY, YOU MUST BE OF MAJORITY 
AGE AND BE OTHERWISE COMPETENT TO ENTER INTO CONTRACTS. IF YOU DO NOT 
MEET THIS CRITERIA OR YOU DO NOT AGREE TO ANY OF THE TERMS AND 
CONDITIONS OF THIS LICENSE, CLICK ON THE REJECT BUTTON TO EXIT.


  GLOSSARY

1. "Applicable Patent Rights" mean: (a) in the case where Original 
Contributor is the grantor of rights, claims of patents that (i) are now 
or hereafter acquired, owned by or assigned to Original Contributor and 
(ii) are necessarily infringed by using or making the Original Code or 
Upgraded Code, including Modifications provided by Original Contributor, 
alone and not in combination with other software or hardware; and (b) in 
the case where Licensee is the grantor of rights, claims of patents that 
(i) are now or hereafter acquired, owned by or assigned to Licensee and 
(ii) are infringed (directly or indirectly) by using or making 
Licensee's Modifications or Error Corrections, taken alone or in 
combination with Covered Code.

2. "Application Programming Interfaces (APIs)" means the interfaces, 
associated header files, service provider interfaces, and protocols that 
enable a device, application, Operating System, or other program to 
obtain services from or make requests of (or provide services in 
response to requests from) other programs, and to use, benefit from, or 
rely on the resources, facilities, and capabilities of the relevant 
programs using the APIs. APIs includes the technical documentation 
describing the APIs, the Source Code constituting the API, and any 
Header Files used with the APIs.

3. "Commercial Use" means any use (internal or external), copying, 
sublicensing or distribution (internal or external), directly or 
indirectly of Covered Code by You other than Your Research Use of 
Covered Code within your business or organization or in conjunction with 
other Licensees with equivalent Research Use rights. Commercial Use 
includes any use of the Covered Code for direct or indirect commercial 
or strategic gain, advantage or other business purpose. Any Commercial 
Use requires execution of both Attachment D and Attachment E by You and 
Original Contributor.

4. "Community Code" means the Original Code, Upgraded Code, Error 
Corrections, Shared Modifications, or any combination thereof.

5. "Community Webserver(s)" means the webservers designated by Original 
Contributor for access to the Original Code, Upgraded Code, TCK and 
Specifications and for posting Error Corrections and Shared 
Modifications.

6. "Compliant Covered Code" means Covered Code that complies with the 
requirements of the TCK.

7. "Contributor" means each Licensee that creates or contributes to the 
creation of any Error Correction or Shared Modification.

8. "Covered Code" means the Original Code, Upgraded Code, Modifications, 
or any combination thereof.

9. "Error Correction" means any change made to Community Code which 
conforms to the Specification and corrects the adverse effect of a 
failure of Community Code to perform any function set forth in or 
required by the Specifications.

10. "Executable" means Covered Code that has been converted from Source 
Code to the preferred form for execution by a computer or digital 
processor (e.g. binary form).

11. "Extension(s)" means any additional Interfaces developed by or for 
You which:  (i) are designed for use with the Technology; (ii) 
constitute an API for a library of computing functions or services; and 
(iii) are disclosed or otherwise made available to third party software 
developers for the purpose of developing software which invokes such 
additional Interfaces.  The foregoing shall not apply to software 
developed by Your subcontractors to be exclusively used by You.

12. "Header File(s)" means that portion of the Source Code that provides 
the names and types of member functions, data members, class 
definitions, and interface definitions necessary to implement the APIs 
for the Covered Code. Header Files include, files specifically 
designated by Original Contributor as Header Files. Header Files do not 
include the code necessary to implement the functionality underlying the 
Interface.

13. "Intellectual Property Rights" means worldwide statutory and common 
law rights associated solely with (i) Applicable Patent Rights; (ii) 
works of authorship including copyrights, copyright applications, 
copyright registrations and "moral rights"; (iii) the protection of 
trade and industrial secrets and confidential information; and (iv) 
divisions, continuations, renewals, and re-issuances of the foregoing 
now existing or acquired in the future.

14. "Interface" means interfaces, functions, properties, class 
definitions, APIs, Header Files, GUIDs, V-Tables, and/or protocols 
allowing one piece of software, firmware or hardware to communicate or 
interoperate with another piece of software, firmware or hardware.

15. "Internal Deployment Use" means use of Compliant Covered Code 
(excluding Research Use) within Your business or organization only by 
Your employees and/or agents on behalf of Your business or organization, 
but not to provide services, including content distribution, to third 
parties, subject to execution of Attachment D by You and Original 
Contributor, if required.

16. "Licensee" means any party that has entered into and has in effect a 
version of this License with Original Contributor.

17. "Modification(s)" means (i) any addition to, deletion from and/or 
change to the substance and/or structure of the Covered Code; (ii) the 
combination of any Covered Code and any previous Modifications; (iii) 
any new file or other representation of computer program statements that 
contains any portion of Covered Code; and/or (iv) any new Source Code 
implementing any portion of the Specifications.

18. "MPEG-4 Patents" means any patents necessary to make, use or sell 
technology implementing any portion of the specification developed by 
the Moving Pictures Experts Group known as MPEG-4, including but not 
limited to all past and future versions, profiles, extensions, parts and 
amendments relating to the MPEG-4 specification.

19. "Original Code" means the initial Source Code for the Technology as 
described on the Community Web Server.

20. "Original Contributor" means RealNetworks, Inc., its affiliates and 
its successors and assigns.

21. "Personal Use" means use of Covered Code by an individual solely for 
his or her personal, private and non-commercial purposes. An 
individual's use of Covered Code in his or her capacity as an officer, 
employee, member, independent contractor or agent of a corporation, 
business or organization (commercial or non-commercial) does not qualify 
as Personal Use.

22. "RCSL Webpage" means the RealNetworks Community Source License 
webpage located at https://www.helixcommunity.org/content/rcsl or such 
other URL that Original Contributor may designate from time to time.

23. "Reformatted Specifications" means any revision to the 
Specifications which translates or reformats the Specifications (as for 
example in connection with Your documentation) but which does not alter, 
subset or superset the functional or operational aspects of the 
Specifications.

24. "Research Use" means use and distribution of Covered Code only for 
Your Personal Use, research or development use and expressly excludes 
Internal Deployment Use and Commercial Use. Research Use also includes 
use of Covered Code to teach individuals how to use Covered Code.

25. "Shared Modifications" means Modifications that you distribute or 
use for a Commercial Use, in addition to any Modifications provided by 
You, at Your option, pursuant to Section 2.2, or received by You from a 
Contributor pursuant to Section 2.3.

26. "Source Code" means the preferred form of the Covered Code for 
making modifications to it, including all modules it contains, plus any 
associated interface definition files, scripts used to control 
compilation and installation of an Executable, or source code 
differential comparisons against either the Original Code or another 
well known, available Covered Code of the Contributor's choice. The 
Source Code can be in a compressed or archival form, provided the 
appropriate decompression or de-archiving software is widely available 
for no charge.

27. "Specifications" means the specifications for the Technology and 
other documentation, as designated on the Community Web Server, as may 
be revised by Original Contributor from time to time.

28. "Trademarks" means Original Contributor's trademarks and logos, 
including, but not limited to, RealNetworks, RealAudio, RealVideo, 
RealOne, RealSystem, SureStream, Helix, Helix DNA and other trademarks 
whether now used or adopted in the future.

29. "Technology" means the technology described in Attachment B, and 
Upgrades.

30. "Technology Compatibility Kit" or "TCK" means the test programs, 
procedures, acceptance criteria and/or other requirements, designated by 
Original Contributor for use in verifying compliance of Covered Code 
with the Specifications, in conjunction with the Original Code and 
Upgraded Code. Original Contributor may, in its sole discretion and from 
time to time, revise a TCK to correct errors and/or omissions and in 
connection with Upgrades.

31. "Upgrade(s)" means new versions of Technology designated exclusively 
by Original Contributor as an "Upgrade" and released by Original 
Contributor from time to time under the terms of the License.

32. "Upgraded Code" means the Source Code and/or Executables for 
Upgrades, possibly including Modifications made by Contributors.

33. "You(r)" means an individual, or a legal entity acting by and 
through an individual or individuals, exercising rights either under 
this License or under a future version of this License issued pursuant 
to Section 4.1. For legal entities, "You(r)" includes any entity that by 
majority voting interest controls, is controlled by, or is under common 
control with You.

34. "Your Products" means any (i) hardware products you distribute 
integrating the Covered Code; (ii) any software products you distribute 
with the Covered Code that utilize the APIs of the Covered Code; or 
(iii) any services you provide using the Covered Code.


  ATTACHMENT A

REQUIRED NOTICES


    ATTACHMENT A-1

REQUIRED IN ALL CASES

Notice to be included in header file of all Error Corrections and Shared 
Modifications:

Portions Copyright 1994-2002 © RealNetworks, Inc.  All rights reserved. 

The contents of this file, and the files included with this file, are 
subject to the current version of RealNetworks Community Source License 
Version 1.0 (the "License"). You may not use this file except in 
compliance with the License executed by both you and RealNetworks.  You 
may obtain a copy of the License at 
https://www.helixcommunity.org/content/rcsl. You may also obtain a copy 
of the License by contacting RealNetworks directly. Please see the 
License for the rights, obligations and limitations governing use of the 
contents of the file.

This file is part of the Helix DNA technology.  RealNetworks, Inc., is 
the developer of the Original code and owns the copyrights in the 
portions it created. 

This file, and the files included with this file, are distributed on an 
'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, 
AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT 
LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.



Contributor(s):

_______________________________________________

Technology Compatibility Kit Test Suite(s) Location:

________________________________


    ATTACHMENT A-2

SAMPLE LICENSEE CERTIFICATION

"By clicking the `Agree' button below, You certify that You are a 
Licensee in good standing under the RealNetworks Community Source 
License, ("License") and that Your access, use and distribution of code 
and information You may obtain at this site is subject to the License. 
If you are not a Licensee under the RealNetworks Community Source 
License you agree not to download, copy or use the Helix DNA technology.


    ATTACHMENT A-3

REQUIRED STUDENT NOTIFICATION

"This software and related documentation has been obtained by your 
educational institution subject to the RealNetworks Community Source 
License. You have been provided access to the software and related 
documentation for use only in connection with your course work and 
research activities as a matriculated student of your educational 
institution. Any other use is expressly prohibited.

THIS SOFTWARE AND RELATED DOCUMENTATION CONTAINS PROPRIETARY MATERIAL OF 
REALNETWORKS, INC, WHICH ARE PROTECTED BY VARIOUS INTELLECTUAL PROPERTY 
RIGHTS.

You may not use this file except in compliance with the License. You may 
obtain a copy of the License on the web at 
https://www.helixcommunity.org/content/rcsl.


  ATTACHMENT B

Description of Technology

Helix DNA, which consists of Helix DNA Client, Helix DNA Server and 
Helix DNA Producer.

Description of "Technology"

Helix DNA Technology v1.0 as described on the Community Web Server.


  ATTACHMENT C

TECHNOLOGY COMPATIBILITY KIT LICENSE

The following license is effective for the Helix DNA Technology 
Compatibility Kit - as described on the Community Web Server. The 
Technology Compatibility Kit(s) for the Technology specified in 
Attachment B may be accessed at the Community Web Server.

1. TCK License.

1.1) Grants to use TCK

Subject to the terms and restrictions set forth below and the 
RealNetworks Community Source License, the Research Use license, and the 
Commercial Use License, Original Contributor grants to You a worldwide, 
non-exclusive, non-transferable license, to the extent of Original 
Contributor's Intellectual Property Rights in the TCK (without the right 
to sublicense), to use the TCK to develop and test Covered Code.

1.2) TCK Use Restrictions.

You are not authorized to create derivative works of the TCK or use the 
TCK to test any implementation of the Specification that is not Covered 
Code. You may not publish your test results or make claims of 
comparative compatibility with respect to other implementations of the 
Specification. In consideration for the license grant in Section 1.1 
above you agree not to develop your own tests that are intended to 
validate conformation with the Specification.

2. Requirements for Determining Compliance.

2.1 Definitions.

a) "Added Value" means code which:

(i) has a principal purpose which is substantially different from that 
of the stand-alone Technology;

(ii) represents a significant functional and value enhancement to the 
Technology;

(iii) operates in conjunction with the Technology; and

(iv) is not marketed as a technology which replaces or substitutes for 
the Technology.

b) "Helix DNA Server Technology" means the program(s) that implement the 
Helix Universal Server streaming engine for the Technology as defined in 
the Specification.

c) .Helix DNA Client Technology. means the Covered Code that implements 
the Helix DNA Client engine as defined in the Specification.

d) .Helix DNA Producer Technology. means the Covered Code that 
implements the Helix Producer engine as defined in the Specification.

e) .Helix DNA Technology. means the Helix DNA Server Technology, the 
Helix DNA Client Technology, the Helix DNA Producer Technology and other 
Helix technologies designated by Original Contributor.

f) "User's Guide" means the users guide for the TCK which Original 
Contributor makes available to You to provide direction in how to run 
the TCK and properly interpret the results, as may be revised by 
Original Contributor from time to time.

2.2 Development Restrictions.

Compliant Covered Code:

a) must include Added Value for any Extensions or Shared Modifications

b) must fully comply with the Specifications for the Technology 
specified in Attachment B;

c) may not modify or remove the Interfaces or underlying functionality 
of the Covered Code except where explicitly allowed under the terms of 
the TCK and Commercial Use License.

d) must expose all APIs to developers and enable developers to directly 
access those APIs concurrently with any other APIs that you expose to 
developers. All such APIs must be fully functional for concurrent 
access. You must provide developers with the same level and quality of 
information regarding access to APIs for the Covered Code that You 
provide for other APIs You expose to developers.

e) may not modify the GUIDs identifying Interfaces, the definition of 
Interfaces or the names identifying Interfaces in the Covered Code.

f) for Helix DNA Client Technology, implement Ask, Tell, Help Compliance 
in accordance with this paragraph and the policy set forth on 
https://www.helixcommunity.org/2002/intro/ask-tell-help. For any 
application that uses the Helix DNA Client Technology, You agree that 
for all file extensions and MIME types proprietary to Original 
Contributor or otherwise supported by a Helix DNA Client, You will not 
change MIME registry, browser preferences or local file associations 
invoking any other party media player without first presenting the user 
with a dialog box or sequence of dialog boxes informing them of the fact 
that they already have such player as the default player for such files 
and of the consequences of making a change and asking the user whether 
the user wants to change the default player. Such dialog box shall 
conform to the .Ask, Tell, Help. policy set forth on 
https://www.helixcommunity.org/2002/intro/ask-tell-help. When asking for 
permission to become the default program you shall provide to the user 
an explanation of any limitations on your program's ability to read 
and/or write the type(s) of files that your are proposing to take by 
default.

2.3 Compatibility Testing.

Successful compatibility testing must be completed by You, or at 
Original Contributor's option, a third party designated by Original 
Contributor, to conduct such tests, in accordance with the User's Guide, 
and using the most current version of the applicable TCK available from 
Original Contributor thirty (30) days (ninety [90] days in the case of 
silicon implementations) prior to: (i) Your Internal Deployment Use; and 
(ii) each release of Compliant Covered Code by You for Commercial Use, 
together with Your Products, if any. In the event that You elect to use 
a version of Upgraded Code that is newer than that which is required 
under this Section 2.3, then You agree to pass the version of the TCK 
that corresponds to such newer version of Upgraded Code

2.4 Test Results.

You agree to provide to Original Contributor or the third party test 
facility if applicable, Your test results that demonstrate that Covered 
Code is Compliant Covered Code and that Original Contributor may publish 
or otherwise distribute such test results.

PLEASE READ THE TERMS OF THIS LICENSE CAREFULLY. BY CLICKING ON THE 
"ACCEPT" BUTTON BELOW YOU ARE ACCEPTING AND AGREEING TO THE TERMS AND 
CONDITIONS OF THIS LICENSE WITH THE ORIGINAL CONTRIBUTOR, REALNETWORKS, 
INC. IF YOU ARE AGREEING TO THIS LICENSE ON BEHALF OF A COMPANY, YOU 
REPRESENT THAT YOU ARE AUTHORIZED TO BIND THE COMPANY TO SUCH A LICENSE. 
WHETHER YOU ARE ACTING ON YOUR OWN BEHALF, OR REPRESENTING A COMPANY, 
YOU MUST BE OF MAJORITY AGE AND BE OTHERWISE COMPETENT TO ENTER INTO 
CONTRACTS. IF YOU DO NOT MEET THIS CRITERIA OR YOU DO NOT AGREE TO ANY 
OF THE TERMS AND CONDITIONS OF THIS LICENSE, CLICK ON THE REJECT BUTTON 
TO EXIT.

RCSL v1.0 rev. date 10-28-02

