Method of protecting broadcast data by fingerprinting a common d

Details Method of protecting broadcast data by fingerprinting a common d Method of protecting broadcast data by fingerprinting a common d

1998-05-08

2000-03-28

Peeso, Thomas R.

Electrical computers and digital processing systems: support

System access control based on user identification by...

Using record or token

713170, 380255, H04L 900

Patent

active

060444649

ABSTRACT:
A well-known technique to discourage piracy of digital objects is to fingerprint the version each customer receives. The invention provides a novel way of fingerprinting the decryption functions given by broadcasters to their customers (usually in the form of smart cards). The main difficulty is to ensure that all the algorithms provided by the broadcaster implement the same decryption function, and yet to make it computationally difficult for a pirate who obtains a large number of such implementations to find even one fundamentally different implementation which is not traceable to a particular customer.

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