System and method for protection of digital works

Details System and method for protection of digital works System and method for protection of digital works

H - Electricity

04

L

H04L 12/22 (2006.01) G06F 1/00 (2006.01) G06F 17/00 (2006.01) G06F 21/00 (2006.01) H04L 9/00 (2006.01) H04L 9/30 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2341931

A method of protecting a digital work uses a blind transformation function 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. The blind transformation function is a function of the original transformation function. For example, the blind transformation function may be a polynomial of the original transformation function. Alternatively, both the blind transformation function and the original transformation function may be any multivariate, integer coefficient affine function.

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