ACCESS CONTROL FOR PORTABLE DATA STORAGE MEDIA

摘要

The system and method of the present invention provides the support of high density removable media (84), such as CD-ROM or MO, tobe used as distributed media for storing data where access thereto is securely restricted. Through this system and method, the secure periodic distribution of several different sets of data information (78) to the end user is achieved with access control selectively performed by at the user's site through communication with the billing/access center (81 & 82). User billing is based on the purchase of the decryption access codes (81 & 82) as indicated by the access code attributes encoded on the media (84). Access code availability if further controlled by selectively providing for updates of decryption access codes.