Apparatus and method for reproducing user data
A technology for user data and data, applied in the protection of information and the field of integrated circuits, it can solve the problems of dangerous and time-consuming decryption keys.
Inactive Publication Date: 2004-09-29
KONINK PHILIPS ELECTRONICS NV
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Problems solved by technology
Illegal distribution of decryption keys may create more danger than illegal distribution of protected user data in clear text, since protected user data includes large amounts of data, typically many megabytes, and is therefore time-consuming
Method used
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Embodiment Construction
[0024] A personal computer 1 is shown in the figure as including a drive unit 2 and an application unit 3 . If a user attempts to reproduce user data stored on a recording medium 4 (for example, like a DVD-ROM) in order to play back video data stored in a DVD in MPEG format, the medium 4 is inserted into the drive 2, wherein the The user data and key data are read out. It should be noted that user data and key data are stored on the medium 4 in encrypted form. It should also be noted that there are different methods of encrypting user data and key data for storage on a recording medium, but which particular method is used is irrelevant for the present invention.
[0025] The read data are then input to an integrated unit 6, preferably implemented using an integrated circuit (IC), comprising different means for computing keys and for decrypting and re-encrypting user data. First, a decryption key is calculated in the key calculation unit 7 using the read key data input from t...
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The invention relates to an apparatus and a method for reproducing user data stored in encrypted form on a recording medium. In order to provide a higher level of protection against hacking of user data and, in particular, of decryption keys, which are used for encrypting said user data and which are also stored on the recording medium, an apparatus is proposed according to the invention, comprising:- means for reading user data and key data from said recording medium, - an integrated unit including- means for calculating a decryption key using said key data, - means for decrypting user data read from said recording medium using said calculated decryption key, and - means for re-encrypting said decrypted data using a re-encryption key,- means for transmitting said re-encrypted data from said integrated unit to an application unit, and- an application unit for decrypting said re-encrypted data using said re-encryption key and for reproducing the decrypted data.
Description
technical field [0001] The present invention relates to an apparatus and method for reproducing user data stored in encrypted form on a recording medium, and to an integrated circuit used in such an apparatus or method. In particular, the present invention relates to the protection of information stored on removable recording media, such as video data on DVDs. [0002] If user data (e.g., video data, audio data, software or application data) is stored in encrypted form on removable recording media, it is often desirable (if permitted) to be able to read and use all An authorized application of said user data without retrieving the decryption key from a separate location such as the Internet. Thus, the decryption key must be stored on the media along with the encrypted user data. Background technique [0003] However, the decryption key must be hidden from unauthorized access. A known technique for hiding the decryption key is to use a media-key-block with a secret player ...
Claims
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IPC IPC(8): G11B20/10G11B20/00H04L9/08H04L9/16
CPCG11B20/00449G11B20/00086G11B20/00275G11B20/00173G11B20/0021G11B20/00478G11B20/00492G11B20/00253
Inventor F·L·A·J·坎佩尔曼A·A·M·斯特林J·P·M·G·林纳茨
Owner KONINK PHILIPS ELECTRONICS NV