Patent ID: 8126150
Filing Date: 2012-02-28
Classification: G06F,G11B,H04L

Abstract:
1. A storage medium processing method for a storage medium and a user terminal, the storage medium being configured to store medium identifier data, medium unique key data generated based on the medium identifier data, user key data encrypted so that the user key data is decrypted using the medium unique key data, and content key data encrypted so that the content key data is decrypted using the user key data, the method comprising: retaining, at the user terminal, content data encrypted so that the content data is decrypted using the content key data, the user terminal being connected to the storage medium; requesting, at the user terminal to a license center, an update of both the user key data and an expiration term of the user key data from the license center by submitting the medium identifier data to the license center; accessing, at the license center, an update history of the user key data corresponding to the submitted medium identifier data; updating, at the license center, the user key data based on an update request, which includes an old user key, from the user terminal in response to an update of the user key data corresponding to the submitted medium identifier data having not been last performed within a predetermined period; refusing, at the license center, the update request, which includes the old user key, from the user terminal in response to the update of the user key data corresponding to the submitted medium identifier data having last been performed within a predetermined period; and displaying, at the user terminal, a message requesting a mailing of the storage medium after a refusal of the update request.