| 摘要 |
<p>A contents data management apparatus comprises a memory that stores contents data, an encrypting device that encrypts the contents data, a first transmitter that transmits encrypted contents data to other contents data management apparatus, a requesting device that requests a check-out permission of the contents data to a server, a receiver that receives the check-out permission from the server, and a second transmitter that transmits information for decrypting the encrypted contents data to the other contents management apparatus when the receiver receives the check-out permission.
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