This excerpt taken from the ATVI 10-Q filed Feb 8, 2006.
Demo Versions. If Publisher wishes to distribute a Demo Version in FPU format, Publisher must obtainMicrosofts prior written approval and Microsoft may charge a reasonable fee to offset costs of the Certification. Subject to the terms of the Xbox 360 Publisher Guide, such Demo Version(s) may be placed on a single disc, either as a stand-alone or with other Demo Versions and the price of such units must be [*] or its equivalent in local currency. Unless separately addressed in the Xbox 360 Publisher Guide, all rights,obligations and approvals set forth in this Agreement as applying to Software Titles shall separately apply to any DemoVersion. [*] If Publishers wishes to distribute a Demo Versions in an online downloadable format, such downloadable Demo Version shall be distributed via by Microsoft Xbox Live in accordance with Section 10.3, and such downloadable Demo Version will be subject to all other terms and policies applicable to Online Content set forth herein and in the Xbox 360 Publisher Guide.