Information recording/replaying apparatus and method
AssigneeKabushiki Kaisha Toshiba
InventorMasahiro Yamada
Life of this patent
Estimating the term…
Abstract
A content including replay condition information is encrypted using first key information while being recorded to a recording medium. The first key information is encrypted using the replay condition information and second key information while being recorded to the recording medium together with the replay condition information. The replay condition information and the first key information are read from the recording medium, and the first key information is decrypted using the replay condition information and the second key information. The content read from the recording medium is decrypted using the decrypted first key information.
Claims21
An information recording/replaying apparatus comprising:
- a first recording section for encrypting a content with a first key and recording the encrypted content;
- a second recording section for calculating the first key using conditions for replaying the content and a second key and recording the first calculated key;
- a first replaying section for reading the conditions for replaying the content and the first calculated key and calculating the first calculated key using the conditions for replaying the content and the second key;
- and
- a second replaying section for reading the encrypted content and decrypting the encrypted content using the first key calculated by the first replaying section.
An information recording/replaying apparatus comprising:
- a first recording section for encrypting a content with a first key and recording the encrypted content;
- a second recording section for encrypting the first key using conditions for replaying the content and a second key and recording the first encrypted key;
- a first replaying section for reading the conditions for replaying the content and the first encrypted key and decrypting the first encrypted key using the conditions for replaying the content and the second key;
- and
- a second replaying section for reading the encrypted content and decrypting the encrypted content using the first key decrypted by the first replaying section.
An information recording/replaying method comprising:
- encrypting a content with a first key;
- recording the encrypted content;
- encrypting the first key using conditions for replaying the content and a second key;
- recording the first encrypted key;
- reading the conditions for replaying the content and the first encrypted key;
- decrypting the first encrypted key using the conditions for replaying the content and the second key;
- reading the encrypted content;
- and
- decrypting the encrypted content using the first key decrypted by the decrypting the first encrypted key.
Dependencies are inferred from the claim text.