Patent ID: 7809944
Filing Date: 2010-10-05
Classification: H04L

Abstract:
1. A method of providing information for decrypting a content key, comprising: connecting to a portable terminal so as to communicate data to and from a playback device containing content encrypted with the content key; authenticating the portable terminal including, authenticating a user of the portable terminal without communicating information regarding the user to the playback device; and transmitting decryption information, including a license key, to the portable terminal when it is determined by the license server that the encrypted content should be decrypted by the portable terminal, the decryption information for decrypting an encrypted form of the content key so that the content key is decrypted in the portable terminal with the license key stored by the portable terminal and identified by the license ID, the license ID identifying the license key corresponding to specific content to be decrypted at the playback device by the decrypted content key; wherein the decrypted content key is sent to the playback device to decrypt the specific content of the playback device corresponding to the license ID.