DIGITAL RIGHTS MANAGEMENT SYSTEM OPERATING ON COMPUTING DEVICE AND HAVING BLACK BOX TIED TO COMPUTING DEVICE

摘要

A digital rights management (DRM) system operates on a computing device (14) when a user requests that an encrypted piece of digital content be rendered by the computer device (14). The computing device (14) has an identifier. A black box (30) performs decryption and encryption functions in the DRM system. The black box (30) includes a key file and an executable. The key file includes at least one black box public key and is expected to include the identifier of the computing device (14), the black box (30) thus being tied to the computing device (14) by inclusion of such first identifier. A digital license (16) corresponding to the digital content is resident in the DRM system and includes a decryption key for decrypting the encrypted digital content. The decryption key is expected to be encrypted according to the black box public key of the key file of the black box (30), the license (16) thus being tied to the black box (30) and by extension the computing device (14). If the identifier of the computing device (14) is in fact different than the identifier in the key file of the black box (30), a different key file is produced based on the black box public key(s) of the key file and the different identifier of the computing device (14).