Patent ID: 8527764
Filing Date: 2013-09-03
Classification: H04L,H04N

Abstract:
1. A secure communication method between devices, the method comprising: obtaining, by a first device from a second device, a parameter for protecting a content; performing, based on the obtained parameter, a mutual authentication with the second device which includes: authenticating the second device using the certificate of the second device; exchanging a key with the second device, the key authenticated through the certificate of the second device to establish a secure authenticated channel with the second device; and changing a content license protection mode corresponding to the content from a first content license protection mode to a second content license protection mode when the content is copied or moved from the second device; wherein the content license protection mode includes any one of: a secure authenticated channel protection mode which protects the license using a secure authenticated channel key during transfer of the license, an authorized domain secret protection mode which protects the license using an authorized domain secret protection, a secure authenticated channel/authorized domain protection mode which protects the license through the secure authenticated channel and authorized domain secret protection, and a device key protection mode which protects the license using a device key during storage of the license.