Patent ID: 7986787
Filing Date: 2011-07-26
Classification: G09C,H04L

Abstract:
1. A processor-implemented method of tracing a traitor from a circumvention device, the circumvention device comprising a set of compromised device keys obtained from the traitor, the method comprising: generating a hypothesized model using a computer processor on a hypothesized set of device keys that models a hypothesis that the circumvention device comprises the hypothesized set of device keys, wherein the hypothesized model is represented by any of a tabular form, a function, a graphical model, and a Bayesian network; removing the first compromised device key, adding new keys to the hypothesized set of keys and updating the hypothesized model, wherein updating the hypothesized model comprises: iteratively detecting additional compromised device keys from the set of compromised device keys, until substantially all the compromised device keys in the set of compromised device keys are identified so as to disable the circumvention device; and creating a media key block (MKB) on the hypothesized set of device keys that disables the circumvention device.