Patent ID: 9252957
Filing Date: 2016-02-02
CPC Classification: H04L

Claim Text:
1. A method for distributing content in a content distribution system comprising: signing at a content packager the content to obtain a content signature; encrypting at the content packager a content using a content encryption key to generate an encrypted content, wherein at least part of the content signature is used as the content encryption key for generating the encrypted content; sending the content encryption key and a list of players from the content packager over a network to a licensing authority; receiving from the licensing authority at the content packager a distribution key containing an encryption of the content decryption key for a given set of authorized devices among the list of players; and distributing the encrypted content and the distribution key; generating at the content packager a set of hierarchical keys K encrypting at the content packager the content encryption key using the first key K encrypting each key K sending to the licensing authority, instead of the content encryption key, the last key K wherein the distribution key received from the licensing authority contains an encryption of the last key K wherein the first key K