rcsl.txt

linux下的一款播放器

The RCSL is made up of a base agreement and a few Attachments.

For Research and Development use, you agree to the terms of the
RCSL R&D License (base RCSL and Attachments A, B, and C) 

For Commercial Use (either distribution or internal commercial
deployment) of the Helix DNA with or without support for RealNetworks'
RealAudio and RealVideo Add-on Technology, you agree to the
terms of the same RCSL R&D license
and execute one or more additional Commercial Use License attachments
<see http://www.helixcommunity.org/content/rcsl-attachments>.

------------------------------------------------------------------------


    REALNETWORKS COMMUNITY SOURCE LICENSE

Version 1.2 (Rev. Date: January 22, 2003).


  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 five distinct licenses:

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

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

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

iv) Add-On Technology License (Executable) Commercial Use License
-Attachment F.

v) Add-On Technology Source Code Porting and Optimization
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
and Trademark, Add-On Technology License, and the Add-On Technology
Source Code Porting and Optimization 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.

3.2 Commercial Use License.

You may not make Commercial Use of any Covered Code unless You and
Original Contributor have executed a copy of the Commercial Use and
Trademark License attached as Attachment D.

*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.