Content management by encryption method, recording and/or reproducing apparatus, and recording medium.

摘要

In a content management method, content data is encrypted by a first key (TK), the first key is encrypted by plural types of second keys (MUK), the encrypted first key (Enc-TK) is multiply encrypted by a third key (MM), and the third key is encrypted by a fourth key (MMK). These encrypted content data (End-Contents), a medium key which is the first key (Enc-TK) encrypted by the second key and a move key which is a first key (Enc2-MM) multiply encoded by the second and third keys are recorded in a recording medium, the third key (Enc-MM) encrypted by the fourth key is recorded in a security region. This management method is managed by the move key and the medium key. <IMAGE>