Data recording/reproducing device and saved data processing method, and program proving medium
First Claim
1. A data record reproducing player characterized by the capability of executing reproduction of a program content;
- comprising;
a recording device to record save data of said program content;
an encryption processing unit to execute an encryption process on save data to be stored in said recording device and a decryption process on said save data to reproduce, retrieved from said recording device;
input means to enter use restriction information on save data; and
a control unit to determine an encryption processing method or a decryption processing method for save data, wherein said control unit comprises a structure to determine an encryption processing method for save data to be stored in said recording device following use restriction information input from said input means, and to determine a decryption processing method for save data to reproduce, retrieved from said recording device, according to save data use restriction information set up in a data management file stored in a memory or a recording device said control unit can access, and wherein said encryption processing unit comprises a structure to execute encryption processing or decryption processing on save data with the use of different encryption keys suitable to an encryption processing method or a decryption processing method determined by said control unit.
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Accused Products
Abstract
A record reproducing player and save data processing methods capable of insuring security of save data are provided. Save data is stored in a recording device, encrypted with the use of a program'"'"'s individual encryption key, e.g., a content key, or a save data encryption key created based the content key, and when reproducing the save data a decryption process is conducted on it with the use of the save data decryption key particular to the program. Furthermore, it is made possible to create save data encryption keys based on a variety of restriction information, such as performing the storing and reproducing of the save data by conducting encryption and decryption on the save data with the save data encryption keys and decryption keys created with the use of a record reproducing player'"'"'s individual key or a user'"'"'s password.
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Citations
17 Claims
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1. A data record reproducing player characterized by the capability of executing reproduction of a program content;
- comprising;
a recording device to record save data of said program content;
an encryption processing unit to execute an encryption process on save data to be stored in said recording device and a decryption process on said save data to reproduce, retrieved from said recording device;
input means to enter use restriction information on save data; and
a control unit to determine an encryption processing method or a decryption processing method for save data, wherein said control unit comprises a structure to determine an encryption processing method for save data to be stored in said recording device following use restriction information input from said input means, and to determine a decryption processing method for save data to reproduce, retrieved from said recording device, according to save data use restriction information set up in a data management file stored in a memory or a recording device said control unit can access, and wherein said encryption processing unit comprises a structure to execute encryption processing or decryption processing on save data with the use of different encryption keys suitable to an encryption processing method or a decryption processing method determined by said control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- comprising;
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8. A save data processing method in a data record reproducing player capable of reproducing a program content comprising:
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an encryption processing mode determining step to determine an encryption processing mode to store save data into a recording device according to input use restriction information from input means; and
an encryption key selection step to select an encryption key is applied to encryption processing according to the encryption processing mode determined at said encryption processing mode determining step, and wherein encryption processing is performed on save data with the use of the encryption key selected at said encryption key selection step. - View Dependent Claims (9, 10, 11, 13, 14, 15)
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12. A save data processing method in a data record reproducing player capable of reproducing a program content comprising;
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a decryption processing mode determining step to determine a decryption processing mode to reproduce save data retrieved from a recording device, according to the set use restriction information set up a data management file stored in a memory means or a recording device; and
a decryption key selection step to select a decryption key according to the decryption processing mode determined at said decryption processing mode determining step, and wherein decryption processing is executed on save data with the use of a decryption key selected at said decyption key selection step.
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16. A program providing medium that provides a computer program to have a save data process executed in a data record reproducing player capable of reproducing a program content on a computer system, said program comprising:
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an encryption processing mode determining step to determine an encryption processing mode to store save data into a recording device, according to input use restriction information from input means;
an encryption key selection step to select an encryption key applied to an encryption process oriented to the encryption processing mode determined at said encryption processing mode determining step; and
a step to execute save data encryption processing with the use of an encryption key selected at said encryption key selection step.
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17. A program providing medium that offers a computer program to execute save data processing in a data record reproducing player capable of reproducing the program content on a computer system, said computer program comprising:
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a decryption processing mode determining step to determine a decryption processing mode to reproduce save data retrieved from a recording device, according to set use restriction information set up in a data management file stored in memory means or a recording device;
a decryption key selection step to select decryption key applied in decryption processing oriented to the decryption processing mode determined at said decryption processing mode determining step; and
a step to execute save data decryption processing with the use of a decryption key selected at said decryption key selection step.
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Specification