Player/recorder, contents playing back method and contents recording method
AssigneeHitachi, Ltd.
InventorsMasaru Takahashi, Keisuke Inata, Yuuichi Kubo
Life of this patent
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Abstract
In order to protect the copyright of content and to achieve fast playback of content and improvement in the operability of a player/recorder, content are encrypted and recorded to a removable first recording medium by using a key unique to the first recording medium and, at the same time, content are encrypted and recorded to an included second recording medium using the key unique to the first recording medium.
Claims21
A player/recorder to which a first recording medium storing content can be removably installed, the content being encrypted based on a first key unique to the first recording medium, the player/recorder comprising:
- a second recording medium contained therein;
- the player/recorder recording the content encrypted based on the first key to the second recording medium;
- and
- a decryptor that decrypts the first key from the installed first recording medium and decrypts content recorded in the second recording medium based on the first key.
A player/recorder to which a first recording medium storing encrypted content can be removably installed, the player/recorder comprising:
- a second recording medium contained in the player/recorder;
- and
- the player/recorder recording the encrypted content,
- wherein the player/recorder plays back content recorded in the second recording medium when the first recording medium is installed.
A player/recorder, comprising:
- an encryptor that encrypts received content based on a first key unique to a first recording medium;
- and
- the player/recorder recording the content encrypted by the encryptor to the first recording medium and a second recording medium contained in the player/recorder.
A content playback method in which a first recording medium is removably installed to a player/recorder, and a second recording medium is contained in the player/recorder, the method comprising:
- decrypting a first key for use in encryption of content from the first recording medium storing the encrypted content;
- and
- decrypting and playing back the content recorded in the second recording medium based on the decrypted first key.
A content playback method in which a first recording medium is removably installed to a player/recorder, and a second recording medium is contained in the player/recorder, the method including a step of when the first recording medium storing encrypted content is installed in the player/recorder, playing back the content recorded in the second recording medium.
A content recording method in which a first recording medium is removably installed to a player/recorder, and a second recording medium is contained in the player/recorder, the method comprising the steps of:
- encrypting content based on a first key unique to the first recording medium;
- and
- recording encrypted content to the first recording medium and the second recording medium.
Dependencies are inferred from the claim text.