DIGITAL CONTENT LICENSE GENERATION SYSTEM, DIGITAL CONTENT LICENSE GENERATION METHOD, AND DIGITAL CONTENT LICENSE GENERATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve security in order to, even if a content key is leaked, prohibit a non-licensed user terminal from using digital content, without a significant increase in processing of encryption/decryption.;SOLUTION: A digital content generation apparatus 100d generates fragment content by dividing digital content encrypted with a content key into plural fragments, combining a portion of the fragments, and adding information for restoration to the digital content to the combined fragments, accumulates the fragment content in a license generation apparatus 100a, generates fragment-removed content by combining not-combined fragments of the digital content, and distributes the fragment-removed content to a user terminal 300 via a broadcasting facility 200.;COPYRIGHT: (C)2014,JPO&INPIT