Record carrier comprising encryption indication information
AssigneeKoninklijke Phillips Electronics N.V.
InventorsAntonius Adriaan Maria Staring, Boris Skoric, Menno Anne Treffers, Maurice Jerome Justin Jean-Baptiste Maes
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Abstract
A record carrier, recording device, read-out device and method is provided which provides a flexible security level to protect user data during transmission over a communication bus, also when the data is recorded on a record carrier such as a recordable optical disc. In accordance with the method, management information comprising encryption indication information indicating that user data stored in an associated sector of a record carrier, such as a recordable optical disk, is to be encrypted by a read-out device before being transmitted over a communication bus.
Claims13
Record carrier (10) for storing user data in sectors (S) and management information (M) associated with said sectors (S), wherein said management information (M) comprises an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), each bit indicating to a read-out device whether the user data stored in the associated sector (S) are to be encrypted by the read-out device (2) before being transmitted over a communication bus (6).
Read-out device for reading data from a record carrier (10) storing user data in sectors (S) and management information (M) associated with said sectors (S), wherein said management information (M) comprises an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), each bit (M1) indicating whether the user data stored in the associated sector (S) are to be encrypted by a read-out device (2) before being transmitted over a communication bus (6), comprising:
- a reading unit (21) for reading said user data and said management information (M) from said record carrier (10), a data interpreter (23) for interpreting said management information (M), an encryption unit (24) for encrypting user data of sectors (S) for which the associated encryption indication flag (M1) indicates that said user data are to be encrypted and an output unit (25) for outputting said user data.
Read-out method for reading data from a record carrier (10) storing user data in sectors (S) and management information (M) associated with said sectors (S), wherein said management information (M) comprises an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), each bit (M1) indicating whether the user data stored in the associated sector are to be encrypted by a read-out (2) device before being transmitted over a communication bus (6), comprising the steps of:
- reading said user data and said management information (M) from said record carrier (10), interpreting said management information (M), encrypting user data of sectors (S) for which the associated encryption indication information (M1) indicates that said user data are to be encrypted and outputting said user data.
Recording device for recording data on a record carrier (10) comprising:
- an input unit (27) for receiving user data and a command (C) to record said user data in sectors (S) on a record carrier (10) from a communication bus (6), a command interpreter (26) for interpreting said command (C) so as to identify a decryption indication information (C2) included therein indicating which parts of the received user data are encrypted and are to be decrypted before recording on said record carrier (10), a decryption unit (24) for decrypting the parts of said user data for which the associated decryption indication information (M2) indicates that they are encrypted and are to be decrypted before recording on said record carrier (10), and a write unit (22) for recording said user data in sectors (S) on said record carrier (10) and a management information (M) associated with said sectors (S) comprising an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), each bit (M1) indicating whether user data stored in sectors (S) associated with said management information (M) are to be encrypted by a read-out (2) device before transmission over a communication bus (6).
Recording method for recording data on a record carrier (10) comprising the steps of:
- receiving user data and a command (C) to record said user data in sectors (S) on a record carrier (10) from a communication bus (6), interpreting said command (C) so as to identify a decryption indication information (C2) included therein indicating which parts of the received user data are encrypted and are to be decrypted before recording on said record carrier (10), decrypting the parts of said user data for which the associated decryption indication information (C2) indicates that they are encrypted and are to be decrypted before recording on said record carrier (10), and recording said user data in sectors (S) on said record carrier (10) and a management information (M) associated with said sectors (S) comprising an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), (M1) indicating that user data stored in sectors (S) associated with said management information (M) are to be encrypted by a read-out (2) device before transmission over a communication bus (6).
A computer program embodied on a computer-readable medium for reading data from a record carrier (10) storing user data in sectors (S) and management information (M) associated with said sectors (S), wherein said management information (M) comprises an encryption indication information (M1) comprising a single bit associated with each of said sectors (S), each bit (M1) indicating that the user data stored in the associated sector are to be encrypted by a read-out (2) device before being transmitted over a communication bus (6), comprising:
- a code segment for reading said user data and said management information (M) from said record carrier (10), and
- a code segment for interpreting said management information (M), encrypting user data of sectors (S) for which the associated encryption indication information (M1) indicates that said user data are to be encrypted and outputting said user data.
Dependencies are inferred from the claim text.