Patent ID: 8301881
Filing Date: 2012-10-30
Classification: H04L

Abstract:
1. A method for automatically renewing content protection implementations in devices, the method comprising: on a first substantially periodic basis, automatically pushing a new content protection implementation to a device that contains an existing content protection implementation; wherein the existing content protection implementation comprises (a) existing software for presenting protected content and (b) an existing key to facilitate presentation of protected content; and wherein the new content protection implementation comprises a new key to supersede the existing key for facilitating presentation of protected content; and on a second substantially periodic basis, automatically pushing revocation data to the device, the revocation data to identify a plurality of revoked keys, each revoked key of the plurality of revoked keys comprising a key that has been superseded by the new key of the new content protection implementation; wherein the revocation data is automatically pushed to the device on the second substantially periodic basis only after a corresponding new content protection implementation has already been pushed to the device to equip the device with a replacement key for at least one of the plurality of revoked keys.