| 摘要 |
<p>Exchange of Digital Rights Management (DRM) protected content between two devices (11, 20) without the need for a third party. Each user marks (202, 206) a license (L1, L2) as unusable and the devices the trade licenses. A user then instructs the device to import (218, 228) the received license (L2', L1'). The device verifies (222, 232) that a license has been rendered unusable and only then erases (224, 234) the unusable license and enables (226, 236) the device to use the new license. The content associated with a license may be traded before or after the license exchange, and may also be downloaded from a third party. It is thus possible to exchange DRM protected content without copying the same. Also provided is a device for exchanging licenses.</p> |
