| 摘要 |
<p>An off-line digital media player 400 comprises a near field data communication interface 406 for receiving at least one digital media item comprising (i) content data which is encrypted with a digital rights management ("DRM") key of a DRM regime ("DRM encrypted data"); and (ii) secure data comprising data relating to a first time window of a first predetermined length and the DRM key. A first processor 418 processes the secure data to extract therefrom the data relating to the first time window and the DRM key. A real time clock ("RTC") 420 cooperates with the first processor 418 to enable off-line decryption of the DRM encrypted data utilizing the extracted DRM key during the first time window only, so that the content data may be played out only during the first time window and subject to the DRM regime. The decrypted data is made available to an output stage 412.</p> |
