Data transfer system, data transfer apparatus, data recording apparatus, and data transfer method

A data transfer device, characterized by comprising:

• primary recording medium drive means for performing recording and/or reproduction of data to a primary recording medium;
• storage control means for controlling content data so as to be stored in said primary recording medium in an encrypted compressed data state;
• transmission means for sending data to a data recording device that is connected to be capable of sending data;
• and
• transmission control means for, in a case of sending the content data stored in said primary recording medium to said data recording device through said transmission means, comparing a data compression system and a bit rate that are conformable to said data recording device with a data compression system and a bit rate of content data to be sent, and then allowing said content data to be sent as it is in the encrypted compressed data state in a case of a first comparison result, while allowing said content data to be sent as a state of encrypted non-compressed data in a case of a second comparison result.

A data recording device, characterized by comprising:

• reception means for receiving data sent from a data transfer device connected thereto;
• secondary recording medium drive means for recording data in a secondary recording medium;
• decrypting means for converting encrypted content data having been transferred from said data transfer device into a non-encrypted state;
• and
• recording control means for allowing said secondary recording medium drive means to record compressed data already converted into the non-encrypted state by said decrypting means in said secondary recording medium after performing a required data addition processing on said compressed data in a case of the content data having been received in the encrypted compressed state from said data transfer device, while allowing said secondary recording medium drive means to record non-compressed data already converted into the non-encrypted state by said decrypting means in said secondary recording medium after performing a compression processing on said non-compressed data in a case of the content data having been received in the encrypted non-compressed data state from said data transfer device.

As a data transfer method in a case of transferring content data in an encrypted compressed data state from a data transfer device with the content data stored in the encrypted compressed data state in a primary recording medium to a data recording device for recording said content data in a secondary recording medium, the data transfer method characterized by comprising the steps of:

• comparing a data compression system and a bit rate that are conformable to said data recording device with a data compression system and a bit rate of content data to be sent from said data transfer device;
• sending the content data as it is in the encrypted compressed data state, and then recording the compressed data in said secondary recording medium after performing a required data addition processing on said compressed data upon completion of a conversion into the non-encrypted state in said data recording device, when the data compression system of said content data to be sent is equal to the data compression system that is conformable to said data recording device, and the bit rate of said content data to be sent is not more than the bit rate that is conformable to said data recording device;
• and
• sending the content data as the state of encrypted non-compressed data, and then recording non-compressed data in said secondary recording medium after performing a compression processing on said non-compressed data upon completion of a conversion into the non-encrypted state in said data recording device, when the data compression system of said content data to be sent is not different from the data compression system that is conformable to said data recording device, or when the bit rate of said content data to be sent is higher than the bit rate that is conformable to said data recording device.