Patent ID: 7395438
Filing Date: 2008-07-01
Classification: G06F,G11B,H04L

Abstract:
1. A method performed in combination with a host computer and a device having a device key (DK) with a pre-selected index value, the device for receiving a storage medium or having the storage medium, the storage medium having stored thereon digital content protected according to a secret and a table with a plurality of entries therein, each entry including the secret encrypted according to a key decryptable by the device key (DK) of one of a plurality of devices and an index value, the medium including a first ID thereon identifying such medium and comprising a serial number permanently associated with the medium, and the table including a second ID of the medium stored therein, wherein the table is tied to the medium by the second ID, the method for the device to render the content on the medium and comprising: receiving a request to render the content on the medium; obtaining the table from the medium; obtaining the first ID of the medium therefrom; obtaining the second ID of the medium as stored in the table; comparing the first ID and the second ID to each other; and if the first ID and the second ID match, proceeding by: obtaining the device key (DK) of the device and the index value of such (DK); indexing into an entry of the table based on the obtained index value; selecting the encrypted secret from the indexed-into entry; applying the obtained device key (DK) to the selected encrypted secret to expose the secret; and applying the exposed secret to render the corresponding content.