System and method for protection of digital works
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United States of America Patent
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Apr 26, 2005
Issued Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Oct 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of protecting a digital work uses a format preserving encryption scheme to encrypt the digital work. This enables any native replay application or rendering application to transform an encrypted digital work into encrypted presentation data. The originator's digital content is protected in its original form by not being decrypted. This method enables the rendering or replay application to process the encrypted document into encrypted presentation data without decrypting it first. Encrypted presentation data is then decrypted just before it is displayed to the user. An additive encryption scheme is a particular type of encryption scheme which preserves formatting of a digital work.
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