Copy protected digital data
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United States of America Patent
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Jun 11, 2013
Grant Date -
Nov 9, 2006
app pub date -
Jul 19, 2004
filing date -
Nov 19, 2003
priority date (Note) -
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Abstract
The present invention relates to digital data comprising a passive part (2) comprising content (1) to be protected in encrypted form, an active part (3) comprising information (4) how to decrypt the content (1) comprised in the passive part (2) and a hidden part (6), wherein the active part (3) and the corresponding passive part (2) constitute an active content (8) and the hidden part (6) comprising information (7) about properties of the respective active content (8) and/or respective active part (3) and/or the respective passive part (2). The active part (2) of the active content (8) additionally comprises rules (5) to allow and/or forbid decryption of the content (1) comprised in the passive part (2) of the active content (8) based on the information (7) comprised in the hidden part (6). With that neither a central database has to be accessed nor a special hardware has to be provided.
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