ON-DEMAND DECOMPRESSION AND DECRYPTION WITH RANDOM ACCESS TO INFORMATION

摘要

The present invention is a method and apparatus for storing and decoding a digital content in a storage device. The digital content is encoded based on a predetermined block size to generate an encoded digital content. An offset table is created to contain encoded offsets pointing to the digital content at predetermined block offsets. The encoded digital content and the offset table are stored in the storage device. A page of information in an encoded content is decoded. The encoded content is encoded from an original content. An original offset of an original block in the original content is obtained. The original block contains the page of information. An encoded offset which corresponds to the original offset is obtained. The encoded offset corresponds to an encoded block in the encoded content. The encoded block is decoded to generate a decoded block which corresponds to the original block.