The method of controlling the access to the protective digital contents with the verification of media key block, the system, and the computer program (it reads out,/entry type media key block)

摘要

Topic The method of controlling the access to the protective digital contents with the verification of media key block, the system, and the computer program are offered. Solutions The recorder & the system include media key block (MKB), following to the next contents protective logic which opposes to the surreptitious use of the protective contents, write the protective contents to the record media selectively. After the recorder, when the media does not have MKB, writing MKB which is remembered in the recorder itself to the particular media, the protective contents are written to the particular media. When it possesses MKB which is older than MKB where the media is remembered in the recorder itself, after writing MKB which is remembered in the recorder itself to the particular media, re-encoding the protective contents, you write the recorder, to the particular media. When it possesses MKB which is newer than MKB where the media is remembered in the recorder itself, MKB inside the particular media is used for contents protection. As for the recorder, to be able remember MKB of newer one in non-volatile memory, because as a result, it is possible, to renew MKB which to itself is beforehand remembered effectively it means with to use up-to-date MKB for contents protection. Selective figure Figure 1