Patent ID: 8234718
Filing Date: 2012-07-31
Classification: G06F,G11B

Abstract:
1. A method of allowing a security apparatus which restricts use of content to process contents, the method comprising: generating a nonce of a storage device connected to the security apparatus, the generated nonce having a first value; storing the nonce in a memory separated from the storage device; generating a first content key file of first content stored in the storage device, the first content key file comprising the nonce and a first content key of the first content that permits access to the first content; generating a second content key file of second content stored in the storage device, the second content key file comprising the nonce and a second content key of the second content that permits access to the second content; storing the first content key file and the second content key file in the storage device, the first content key file bound to the first content such that both the first content and the first content key file are deleted from the storage device in response to moving the first content from the storage device to a second storage device; if first content is moved from the storage device to the second storage device, updating the nonce stored in the memory from the first value to a second value and updating the nonce stored in the second content key file from the first value to the second value; and if use of the second content stored in the storage device is requested, determining that the second value of the nonce stored in the memory is equal to the second value of the nonce stored in the second content key file and permitting the requested use of the second content in response to determining the second value of the nonce stored in the memory is equal to the second value of the nonce stored in the second content key file.