UNLOCKING A PROTECTED PORTABLE STORAGE MEDIUM
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Accused Products
Abstract
The invention relates to a method, a media player (10) and a portable storage medium (8) for allowing removal of measures provided on said portable storage medium for disturbing content, as well as a method, a server (36) and a computer program product for allowing removal of measures for disturbing content on a portable storage medium. The media player obtains an identifier (DID) of the medium and a media player identifier (PID), generates an intermediate encryption key (I_K) based on at least these identifiers and sends the intermediate encryption key to the server (36). The server then encrypts an unlocking key (U K) by using at least the intermediate encryption key, and sends the encrypted unlocking key ([U_K]E) to the player, which in turn decrypts the unlocking key by using at least the intermediate encryption key, such that the measures for disturbing the perception of content provided on the medium can be removed.
35 Citations
17 Claims
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1-10. -10. (canceled)
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11. A method of allowing removal of measures provided on a portable storage medium (8) for disturbing the perception of content on the medium, the method comprising the steps of:
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obtaining an identifier (DID) of the medium, (step 40), obtaining an identifier (PID) of a media player (10) arranged for playing media content provided on the medium, (step 42), generating an intermediate encryption key (I_K) from at least the medium identifier and the media player identifier, (step 44), such that a request for removal of the disturbing measure can be made, providing a content provider (36) with at least the intermediate encryption key (step 46), receiving an unlocking key (U_K), which has been encrypted on the basis of at least the intermediate encryption key, (step 48), and decrypting the unlocking key, using at least the intermediate encryption key, step 50), and removing the measures for disturbing the perception of content by using the decrypted unlocking key, (step 52). - View Dependent Claims (12, 13, 14, 15)
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16. A media player (10) for allowing removal of measures provided on a portable storage medium (8) for disturbing the perception of content on the portable storage medium and having an identifier (PID), the media player comprising:
a disturbing measure removal unit (34) arranged to; obtain an identifier (DID) of the medium, obtain the media player identifier (PID), generate an intermediate encryption key (I_K) from at least the medium identifier and the media player identifier, such that a request for removal of the disturbing measure can be made, provide a content provider (36) with at least the intermediate encryption key, receive an unlocking key (U_K), which has been encrypted on the basis of at least the intermediate encryption key, and decrypt the unlocking key, using at least the intermediate encryption key, and remove the measures for disturbing the perception of content by using the decrypted unlocking key, (step 52).
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17. A portable storage medium (8) to be used in a media player (10), the medium having stored thereon:
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media content (C1, C2) and measures (MO2) provided for disturbing the perception of said content, a medium identifier (DID), and a computer program code, which, when loaded in the media player, enables said media player to; obtain the medium identifier, obtain an identifier of the media player (PID), generate an intermediate encryption key (I_K) from at least the medium identifier and the media player identifier, such that a request for removal of the disturbing measure can be made, provide a content provider with at least the intermediate encryption key, and decrypt a received unlocking key (U_K), using at least the intermediate encryption key, remove the measures for disturbing the perception of content by using the decrypted unlocking key, (step 52).
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Specification