Content protection using block reordering

摘要

An apparatus and method for protecting a content item such as a digitally encoded movie, an electronic programming guide, or the like, by reordering blocks of the content item prior to transmitting it to a receiving device. The receiving device constructs a block reordering structure which is used to access the reordered content item, to facilitate retrieval of a desired block from the original content item. The reordering may be done responsive to an identifier value of the receiving device, such as a serial number.

主权项

1. An apparatus comprising:
storage for a local key; storage for a block reordering structure; a reorder structure generator to generate the block reordering structure according to the local key; and a content retriever to retrieve blocks of a content item in an original order according to the block reordering structure, wherein the blocks include a first block and a second block of different block sizes.