Patent ID: 7089429

Claim:
A method of restricting access to digital content data, comprising: storing the digital content data on a user device; classifying the digital content data to determine whether the digital content data is controlled digital content data or non-controlled digital content data; if the digital content data is controlled digital content data: storing a trusted voucher on the user device, the trusted voucher being associated with the controlled digital content data and comprising at least one permitted function; and restricting access to the controlled digital content data by the user device to said at least one permitted function; and if the digital content data is non-controlled digital content data: associating a local voucher stored on the user device with the non-controlled digital content data, the local voucher comprising at least one intended function; restricting access to the non-controlled digital content data by the user device to said at least one intended function; restricting access to the non-controlled digital content data based on a physical characteristic of the user device; and wherein the physical characteristic includes one or more of a maximum number of non-controlled digital content data stored on the user device, and a duration of time since the storing of the digital content data on the user device.