Patent ID: 7080261
Filing Date: 2006-07-18
Classification: G06F,G06K,G11B

Abstract:
1. A computer-readable medium provided with a memory area for storing data and a microprocessor comprising a communication interface for communication with an external device, a memory unit and a processor unit connected to both said communication interface and said memory unit, wherein the data comprises a first data portion which is arranged to be read by a computer arrangement and to be decrypted by the computer arrangement using at least one cryptographic key provided at least one condition is met, and said processor unit which is arranged to communicate with said computer arrangement through said communication interface in order to check whether said condition is met and to calculate said at least one cryptographic key for said computer arrangement once the condition is met, wherein the processor unit calculates the cryptographic key based on key related data and provided to the processor unit by the computer arrangement.