Patent ID: 8984658
Filing Date: 2015-03-17
Classification: G06F,G11B,H04N

Abstract:
1. A content playback device for playing back a digital content, the content playback device comprising: an information acquisition circuit operable to acquire a content playback program that is a computer program for playing back the digital content on a recording medium; a medium type judgment circuit operable to judge whether a type of the recording medium is a read-only type or a recordable type; a signature verification circuit operable to perform verification of a digital signature generated for the content playback program using a signature verification method selected from a signature verification method for a digital signature having an official release type and a signature verification method for a digital signature having a test release type based on a result of the judgment by the medium type judgment circuit; and a playback permission determination circuit operable to stop execution of the content playback program if the verification is unsuccessful.