Patent ID: 8955158
Filing Date: 2015-02-10
Classification: G06F

Abstract:
1. A portable storage device comprising: one or more hardware processors; and memory storing executable instructions that, when executed by the one or more hardware processors, cause the one or more hardware processors to perform the steps of: storing a rights object in the memory; determining whether to generate a current permission status format according to a request received from a device through an interface which is connected to the device for communication; and searching the memory to find a rights object designated by the request, and generating the current permission status format including information of the rights object according to a result of the determining, wherein the current permission status format comprises a content D field for a content ID identifying an encrypted content that can be played back using the rights object, a content encryption key (CEK) field for a CEK used to decrypt the encrypted content, a message digest field for a message digest value for integrity of transmitted data, and a permission information field for the permission information of the rights object.