| 摘要 |
<p>A playing method of digital right managing DRM multimedia is provided in which the basic unit for files of DRM multimedia to be played is page; when the operation of fast-forward/fast-reverse is trigerred, the method includes: determining the time of fast-forward/fast-reverse, determining the number of pages of fast-forward/fast-reverse based on the time of fast-forward/fast-reverse, determining the page of target playing position based on the number the pages of fast-forward/fast-reverse, calculating key stream of page of the target playing position based on the key data of the prestored first page, decrypting the ciphertext of the page of the target playing position based on the key stream of page of the target playing position, decoding the page of target playing position and playing the decrypted page of target playing position. A playing device is also provided. Therefore, effect of playing can be impoved.</p> |
