Patent ID: 6813709
Filing Date: 2004-11-02
Classification: G06F,H04L

Abstract:
A method of restricting access to recorded digital data on a support medium using an integrated circuit associated with the support medium containing a first decryption key, comprising:encrypting one or more elements of a volume descriptor of the support medium with a corresponding encryption key; recording the encrypted one or more elements of the volume descriptor describing characteristics of non-encrypted data together with said non-encrypted data on the support medium; and when accessing the support medium, using the first decryption key of the integrated circuit associated with the support medium to decrypt the encrypted one or more elements of the volume descriptor and supply a reader with the decrypted one or more elements of the volume descriptor so as to permit reading and/or writing of the non-encrypted data on the support medium, re-encrypting the volume elements by the integrated circuit according to a new key generated and stored in the integrated circuit, and recording the re-encrypted volume elements on the medium by the reader, replacing the previously encrypted values, wherein the integrated circuit and the support medium are removable from the reader.