Patent ID: 7137012
Filing Date: 2006-11-14
Classification: G06F,H04L

Abstract:
1. A memory card comprising: a storage portion including a secret area which is capable of being accessed only by a specific secret procedure and a public area which is capable of being accessed by an ordinary procedure, the public area including a rewritable public area and a read-only public area on which revocation information is registered, the revocation information being used to determine whether or not use of the memory card by an electronic device is to be revoked; and a controller which determines whether or not use of the memory card by an electronic device which attempts to access the memory card is to be revoked, based on the revocation information registered on the read-only public area of the memory card and information sent from the electronic device, wherein the controller sends a key needed for a content exchange to the electronic device when the controller does not determine that use of the memory card by the electronic device is to be revoked, and wherein a content which is encrypted using the key is written on the rewritable public area of the memory card by the electronic device.