Irdeto B.v.

Wilhelmus Petrus Adrianus Johannes Michiels

Paulus Mathias Hubertus Mechtildis Antonius Gorissen

Hendrik Dirk Lodewijk Hollmann

Paulus Mathias Hubertus Merchtildis Antonius Gorissen

A method of controlling distribution of digital content () is presented. A version () of a program () is needed to use the content. A plurality of versions of the program () is generated, each version being unique with respect to incorporated code fragments and/or associated locations thereof. The plurality of respective code fragments () each cause a processor to perform a respective test regarding a data characteristic on content to be processed by the program for restricting the processing of content for which the permission has not been granted. The respective code fragments () are incorporated at respective locations in the program () to obtain the version () of the program ().

Controlling distribution of digital content

A method and system is provided facilitating tracing copies of an implementation of a computational method where different versions of a network of look-up tables representing steps of the computational method are generated, and stored in a memory, each version being unique so that output encodings and/or input decodings of the white-box implementations of the computational method are different in the different versions. The network is formed by using an output value of a first look-up table as an input value of a second look-up table. The different versions are generated by changing at least one value in the network, end results of the version corresponding to a relevant domain of input values being substantially the same for each version. A method and system for computation for a user with the corresponding version in the memory, and/or for identifying a copy of an implementation of the computational method is provided.

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Eindhoven, Netherlands

Wilhelmus Petrus Adrianus Johannes Michiels