This excerpt taken from the ATVI 10-K filed Jun 14, 2007.
3.3 Form of Distribution. Executable Software distributed physically to end users and demonstration discs shall be in the form of PlayStation 3 Format Discs only. Publisher shall not, directly or indirectly, incorporate more than one Disc Product in a single Unit, or package or bundle Units of any Disc Product with any other goods or services, without the SCE Companys prior written consent. Online Products, Online Gameplay and any services associated with Online Gameplay, including subscriptions, shall be distributed or made available electronically, including by wireless distribution, to end users over the PlayStation®Network only, unless the SCE Company gives express written consent to another manner of distribution on SCE Company standard terms or otherwise as agreed. Notwithstanding this limitation, Publisher may electronically transmit Executable Software from site to site, or from machine to machine over a computer network, for the sole purposes of facilitating development and for testing to be carried out under Section 6; provided that no right of retransmission shall attach to any such transmission, and provided further that Publisher shall use reasonable security measures customary within the high technology industry to reduce the risk of unauthorized interception or retransmission of such transmissions.