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

• US 20030196101A1
• Filed: 05/12/2003
• Published: 10/16/2003
• Est. Priority Date: 04/13/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kon, Takayasu, Kamada, Yasunori, Morinaga, Eiichiro, Abe, Miki
• Granted Patent: US 7,164,767 B2
• Time in Patent Office: Days
• US Class Current: 713/193
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00224 wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/00514 wherein the entire content is encrypted with the same key, e.g. disc key or master key
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 2020/10981 Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable

Abstract

It is an object to provide an efficient transfer of content data. In a case of transferring the content data from a data transfer device on a primary recording medium side to a data recording device to record the content data in a secondary recording medium, a data compression system and a bit rate that are conformable to the data recording device are compared with a data compression system and a bit rate of the content data to be sent, so that a required transfer processing is brought into realization according to a result of the comparison. For instance, when both the data compression systems are equal, and the bit rate of the content data is not more than the bit rate that is conformable to the data recording device, the content data is sent as it is in an encrypted compressed data state.

Claims

1. In a data transfer system comprising a data transfer device and a data recording device, said data transfer system characterized in that:

said data transfer device includes;

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 said data recording device; 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, and

said data recording device includes;

reception means for receiving data sent from said data transfer device;

secondary recording medium drive means for recording data in a secondary recording medium;

decrypting means for converting the 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 the compressed data already converted into the non-encrypted state by said decrypting means in said secondary recording medium after performing a required addition processing on said compressed data in a case of the content data having been sent in accordance with said first comparison result, 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 sent in accordance with said second comparison result.

2. The data transfer system according to claim 1, characterized in that said first comparison result is a comparison result that the data compression system of the content data to be sent is equal to the data compression system that is conformable to said data recording device and that the bit rate of the content data to be sent is not more than the bit rate that is conformable to said data recording device.

3. The data transfer system according to claim 1, characterized in that said second comparison result is a comparison result that the data compression system of the content data to be sent is different from the compression system that is conformable to said data recording device, or that the bit rate of the content data to be sent is higher than the bit rate that is conformable to said data recording device.

4. The data transfer system according to claim 1, characterized in that said recording control means controls a transfer state in accordance with a reception processing state in said reception means and a signal processing state of said secondary recording medium drive means in a case of transferring stream data as the compressed data or non-compressed data already converted into the non-encrypted state by the decrypting means toward said secondary recording medium drive means for a processing of recording said stream data in said secondary recording medium.

5. 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.

6. The data transfer device according to claim 5, characterized in that said first comparison result is a comparison result that the data compression system of the content data to be sent is equal to the data compression system that is conformable to said data recording device and that the bit rate of the content data to be sent is not more than the bit rate that is conformable to said data recording device.

7. The data transfer device according to claim 5, characterized in that said second comparison result is a comparison result that said data compression system of the content data to be sent is different from the data compression system that is conformable to said data recording device, or that the bit rate of the content data to be sent is higher than the bit rate that is conformable to said data recording device.

8. 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.

9. The data recording device according to claim 8, characterized in that said recording control means controls a transfer state according to a reception processing state in said reception means and a signal processing state of said secondary recording medium drive means, in a case of transferring stream data as the compressed data or non-compressed data already converted into the non-encrypted state by said decrypting means toward said secondary recording medium drive means for a processing of recording said stream data in said secondary recording medium.

10. 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.