Data transfer system, data transfer apparatus, data-recording apparatus, data management method, identifier generation method
First Claim
1. :
- A data transfer system comprising a data transfer apparatus and a data-recording apparatus wherein;
said data transfer apparatus comprises;
primary-recording-medium driving means for recording and reproducing data onto and from a primary recording medium;
storage controlling means for controlling said primary-recording-medium driving means to store content data in an encrypted state and a first content identifier generated uniquely to said content data onto said primary recording medium;
communication means for carrying out a variety of data communications including transfers of content data with said data-recording apparatus; and
transfer management means for managing rights to transfer content data and for managing transfer rights of content data already transferred to said secondary recording medium by using a generated table for associating said first content identifier with a second content identifier received from said data-recording apparatus and generated by said data-recording apparatus for said content data already transferred to said data-recording apparatus, whereas said data-recording apparatus comprises;
communication means for carrying out data communications including exchanges of content data with said data transfer apparatus;
secondary-recording-medium driving means for recording and reproducing data onto and from said secondary recording medium;
decryption means for decrypting encrypted content data received from said data transfer apparatus, putting said content data in an unencrypted state;
recording controlling means for controlling said secondary-recording-medium driving means to record said encrypted content data decrypted by said decryption means onto said secondary recording medium;
identifier generation means for generating a second content identifier of said content data from said content data in said unencrypted state; and
identifier-transmission controlling means for requesting said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.
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Accused Products
Abstract
A data transfer system provided by the present invention is capable of executing proper management of content transfers with a high degree of efficiency. In a data transfer apparatus employing a primary recording medium, rights to transfer contents stored in a primary recording medium are managed, and transfer rights of contents already transferred to a secondary recording medium employed in a data-recording apparatus are managed by using a generated table for associating first content identifiers each generated by the data transfer apparatus for a content stored in the primary recording medium with a second content identifier received from the data-recording apparatus and generated by the data-recording apparatus for the content, which has already been transferred to the data-recording apparatus. Thus, even if the secondary recording medium cannot be used for recording a second content identifier (or a content ID), a content ID (a second content identifier) generated for a content can be used for identifying the content by associating the content ID (the second content identifier) with a content ID (a first content identifier) stored in the primary recording medium.
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Citations
25 Claims
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1. :
- A data transfer system comprising a data transfer apparatus and a data-recording apparatus wherein;
said data transfer apparatus comprises;
primary-recording-medium driving means for recording and reproducing data onto and from a primary recording medium;
storage controlling means for controlling said primary-recording-medium driving means to store content data in an encrypted state and a first content identifier generated uniquely to said content data onto said primary recording medium;
communication means for carrying out a variety of data communications including transfers of content data with said data-recording apparatus; and
transfer management means for managing rights to transfer content data and for managing transfer rights of content data already transferred to said secondary recording medium by using a generated table for associating said first content identifier with a second content identifier received from said data-recording apparatus and generated by said data-recording apparatus for said content data already transferred to said data-recording apparatus, whereas said data-recording apparatus comprises;
communication means for carrying out data communications including exchanges of content data with said data transfer apparatus;
secondary-recording-medium driving means for recording and reproducing data onto and from said secondary recording medium;
decryption means for decrypting encrypted content data received from said data transfer apparatus, putting said content data in an unencrypted state;
recording controlling means for controlling said secondary-recording-medium driving means to record said encrypted content data decrypted by said decryption means onto said secondary recording medium;
identifier generation means for generating a second content identifier of said content data from said content data in said unencrypted state; and
identifier-transmission controlling means for requesting said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- A data transfer system comprising a data transfer apparatus and a data-recording apparatus wherein;
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9. :
- A data transfer apparatus comprising;
primary-recording-medium driving means for recording and reproducing data onto and from a primary recording medium;
storage controlling means for storing encrypted content data and first content identifier generated inherently for the content data onto said primary recording medium;
communication means for carrying out a variety of data communications including transfers of content data with an external data-recording apparatus; and
transfer management means for managing rights to transfer content data and for managing transfer rights of content data already transferred to said external data-recording apparatus by using a generated table for associating said first content identifier with a second content identifier received from said external data-recording apparatus and generated by said data-recording apparatus for said content data already transferred to said data-recording apparatus. - View Dependent Claims (10, 11)
- A data transfer apparatus comprising;
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12. :
- A data-recording apparatus comprising;
communication means for carrying out data communications including exchanges of content data with an external data transfer apparatus;
secondary-recording-medium driving means for recording and reproducing data onto and from a secondary recording medium;
decryption means for decrypting encrypted content data received from said external data transfer apparatus, putting said content data in an unencrypted state;
recording controlling means for controlling said secondary-recording-medium driving means to record said encrypted content data decrypted by said decryption means onto said secondary recording medium;
identifier generation means for generating a content identifier from said content data in said unencrypted state; and
identifier-transmission controlling means for requesting said communication means to transmit said content identifier generated by said identifier generation means to said external data transfer apparatus. - View Dependent Claims (13, 14, 15, 16, 17)
- A data-recording apparatus comprising;
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18. :
- A data management method for managing transfer rights of encrypted content data recorded on a primary recording medium to a secondary recording medium, said data management method comprising the steps of;
managing rights to transfer said content data by associating said content data with a first content descriptor generated for said content data; and
managing transfer rights of content data already transferred to said secondary recording medium by using a generated table for associating said first content identifier with a second content identifier received from said secondary recording-medium apparatus and generated by said secondary recording-medium apparatus for said content data already transferred to said secondary recording-medium apparatus. - View Dependent Claims (19, 20)
- A data management method for managing transfer rights of encrypted content data recorded on a primary recording medium to a secondary recording medium, said data management method comprising the steps of;
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21. :
- An identifier generation method whereby a portion of said content data is extracted from a sampling point determined on the basis of the length of said content data, and a content identifier is generated by carrying out a process using said extracted portion.
- View Dependent Claims (22, 23, 24, 25)
Specification