Reproducing encrypted content using region keys
First Claim
1. Reproducing apparatus (1) for reproducing content stored in encrypted form on a record carrier (2), said record carrier (2) further storing a carrier region code (RCC) indicating in which region said content shall be allowed to be reproduced and an encrypted region key (RK) for decrypting said content, comprising:
- a region code storage means (10) for storing a device region code (RCD), a device key storage means (11) for storing a device key (DK), said device key (DK) being different for all regions, a carrier region code reading means (12) for reading said carrier region code (RCC) from said record carrier (2), a region code check unit (13) for checking if said carrier region code (RCC) matches said device region code (RCD), a region key reading means (14) for reading said encrypted region key (RK) from said record carrier (2), a region key decryption means (16) for decrypting said encrypted region key (RK) using said device key (DK) in case said carrier region code (RCC) matches said device region code (RCD), a content reading means (17) for reading said encrypted content from said record carrier (2), a content decryption means (18) for decrypting said encrypted content using said decrypted region key and output means (19) for outputting said decrypted content.
1 Assignment
0 Petitions
Accused Products
Abstract
A reproducing apparatus (1) reproduces content stored in encrypted form on a record carrier (2). The record carrier (2) further stores a carrier region code (RCC) indicating in which region content shall be allowed to be reproduced and an encrypted region key (RK) for decrypting content, in order to make it more difficult to hack a reproducing apparatus (1) for it to play record carriers having a wrong region code. The reproducing apparatus (1) has a region code storage (10) for storing a device region code (RCD), and a device key storage (11) for storing a device key (DK), which device key (DK) is different for all regions. The reproducing apparatus (1) reads a carrier region code (RCC) from the record carrier (2), checks if the carrier region code (RCC) matches the device region code (RCD), reads the encrypted region key (RK) from the record carrier (2), decrypts the encrypted region key (RK) using said device key (DK) in case the carrier region code (RCC) matches the device region code (RCD), reads the encrypted content from the record carrier (2), decrypts the encrypted content using the decrypted region key (RCD) and outputs the decrypted content.
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Citations
13 Claims
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1. Reproducing apparatus (1) for reproducing content stored in encrypted form on a record carrier (2), said record carrier (2) further storing a carrier region code (RCC) indicating in which region said content shall be allowed to be reproduced and an encrypted region key (RK) for decrypting said content, comprising:
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a region code storage means (10) for storing a device region code (RCD), a device key storage means (11) for storing a device key (DK), said device key (DK) being different for all regions, a carrier region code reading means (12) for reading said carrier region code (RCC) from said record carrier (2), a region code check unit (13) for checking if said carrier region code (RCC) matches said device region code (RCD), a region key reading means (14) for reading said encrypted region key (RK) from said record carrier (2), a region key decryption means (16) for decrypting said encrypted region key (RK) using said device key (DK) in case said carrier region code (RCC) matches said device region code (RCD), a content reading means (17) for reading said encrypted content from said record carrier (2), a content decryption means (18) for decrypting said encrypted content using said decrypted region key and output means (19) for outputting said decrypted content. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Reproducing method for reproducing content stored in encrypted form on a record carrier (2), said record carrier (2) further storing a carrier region code (RCC) indicating in which region said content shall be allowed to be reproduced and an encrypted region key (RK) for decrypting said content, comprising the steps of:
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reading said carrier region code (RCC) from said record carrier (2), checking if said carrier region code (RCC) matches a device region code (RCD) stored in a reproduction apparatus (1), reading said encrypted region key (RK) from said record carrier (2), decrypting said encrypted region key (RK) using a device key (DK) stored in said reproduction apparatus (1) in case said carrier region code (RCC) matches said device region code (RCD), reading said encrypted content from said record carrier (2), decrypting said encrypted content using said decrypted region key (RCD) and outputting said decrypted content. - View Dependent Claims (13)
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12. Record carrier (2) storing
content in encrypted form for reproduction by reproducing apparatus (1), a carrier region code (RCC) indicating in which region said content shall be allowed to be reproduced and an encrypted region key (RK) for decrypting said content, wherein during reproduction said carrier region code (RCC) is used to check if said carrier region code (RCC) matches a device region code (RCD) stored in a reproduction apparatus (1), said encrypted region key (RK) is decrypted using a device key (DK) stored in said reproduction apparatus (1) in case said carrier region code (RCC) matches said device region code (RCD), and said encrypted content is decrypted using said decrypted region key.
Specification