DIGITAL CONTENT PLAYBACK IN CONTENT PROTECTION SYSTEM IN ACCORDANCE WITH SEVERAL CHAIN DIGITAL LICENSES Russian patent published in 2010 - IPC H04L9/08 G06F21/24 

FIELD: physics; communications.

SUBSTANCE: invention relates to the technology of protecting digital content, and specifically to playing back digital content using licenses. A chain comprises an end license associated with content at one end, and a root license at the other end and all intermediate licenses in between. The end license and all intermediate licenses in the chain are attached to neighbouring licenses in the chain towards the root license, and the root license is attached to the private key owner (PR-U). Each license in the chain is verified and confirmation is made of whether the license allows content playback. A decryption key is obtained from the end license based on application of (PR-U) to the root license. The obtained key is used to decrypt the encrypted content, and the decrypted content is played back.

EFFECT: provision of playback of encrypted digital content on a computer in accordance with a license chain, on which a request for playing back encrypted content is received and a license chain corresponding to that content is found.

5 cl, 5 dwg