Patent ID: 7937407
Filing Date: 2011-05-03
Classification: G11B,H04H,H04L,H04N

Abstract:
1. An access control method characterized by comprising: a producer information embedding step of embedding identification information indicating a producer of metadata produced for content in the metadata, the metadata further comprising additional description of the content, said producer information embedding step further for embedding, when the metadata are additionally edited by a different producer, identification information indicating the different producer in the metadata; a step of embedding, in the content as license information required to play back the content, identification information indicating a permitted producer of the metadata that is permitted access to the content and identification information indicating a permitted different producer of the metadata that is permitted to additionally edit the metadata; and an access propriety control step of comparing the identification information of the metadata with the identification information of the content to control propriety of access to the content from the metadata by whether all of the identification information of the metadata are included in the identification information of the content, wherein the metadata further comprises a program description, a segment information table comprising a segment list and a segment group list, signedInfo comprising a signature method algorithm and a reference URL, a signature value, and keyInfo.