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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) Redistribu