Data processing apparatus, data processing method, terminal unit, and transmission method of data processing apparatus
A data processing apparatus is disclosed, that comprises a large capacity memory means for storing a plurality of files, a memory means for storing move/copy history when a particular file is moved/copied from the large capacity memory means to a non-volatile memory, a reference means for referencing the history information stored in the memory means when the particular file is moved/copied from the large capacity memory means to the non-volatile memory, and a control means for prohibiting the particular file from being moved/copied from the large capacity memory means to the non-volatile memory when the reference means has detected that the history information is stored in the memory means.
1. A data processing apparatus comprising an attachable/detachable non-volatile recording medium and a host for receiving/transmitting encrypted contents data from/to the attachable/detachable non-volatile recording medium,
wherein the attachable/detachable non-volatile recording medium comprises:
an interface for receiving from the host contents data encrypted with a first key by first encrypting means at the host, and the first key encrypted with a second key;
decrypting means for decrypting the encrypted first key with the second key;
second encrypting means for re-encrypting the decrypted first key with a third key, the third key stored in the attachable/detachable non-volatile recording medium;
storage means for storing, in the attachable/detachable non-volatile recording medium, the first key re-encrypted with the third key and the contents data encrypted with the first key;
receiving means for receiving, from the storage means, the first key re-encrypted with the third key; and
decrypting means for decrypting, with the third key, the first key re-encrypted with the third key, and
wherein the host comprises:
encrypting means for re-encrypting the decrypted first key with a fourth key that is different from the third key; and
storing means for storing the contents data encrypted with the first key and the first key re-encrypted with the fourth key.
2. The data processing apparatus as set forth in claim 1 , wherein the contents data has been compressed corresponding to a predetermined compressing method.
3. The data processing apparatus as set forth in claim 1 , wherein the attachable/detachable non-volatile recording medium includes a management area that includes a contents cumulation number corresponding to each data unit of the contents data.
4. The data processing apparatus as set forth in claim 1 , wherein the attachable/detachable non-volatile recording medium includes a management area that includes a number unique to the second encrypting means.
5. The data processing apparatus as set forth in claim 1 , wherein the attachable/detachable non-volatile recording medium includes a management area that includes a file number assigned to each data unit of the contents data.
6. The data processing apparatus as set forth in claim 1 , wherein the first key is created for each data unit of the contents data.
7. The data processing apparatus as set forth in claim 1 , wherein the attachable/detachable non-volatile recording medium includes a flash memory.
8. The data processing apparatus as set forth in claim 1 , wherein the host further comprises:
input means for inputting linear digital contents data;
compression process means for compressing the linear digital contents data; and
encrypting means for encrypting compressed linear digital contents data with the first key and encrypting the first key with the second key.
9. A method of transmitting data between an attachable/detachable non-volatile recording medium and a host to which the attachable/detachable non-volatile recording medium connects, the method comprising:
encrypting, at the host, contents data with a first key;
encrypting, at the host, the first key with a second key;
decrypting, at the attachable/detachable non-volatile recording medium, the encrypted first key with the second key;
re-encrypting, at the attachable/detachable non-volatile recording medium, the decrypted first key with a third key;
outputting, to the host, the first key re-encrypted with the third key and the contents data encrypted with the first key;
receiving, at the host, the first key re-encrypted with the third key and the contents data encrypted with the first key;
decrypting, with the third key at the host, the first key re-encrypted with the third key;
re-encrypting, at the host, the decrypted first key with a fourth key stored in the host; and
storing, at the host, the contents data encrypted with the first key and the first key re-encrypted with the fourth key.