METHOD AND APPARATUS FOR EFFICIENT INTERRUPTIBLE TRANSFER OF PROTECTED MEDIA ASSETS

摘要

A method and system is provided for efficient interruptible transfer of protected media assets. The method of asset transfer uses a segmented asset transfer paradigm which makes possible the implementation of such features as “watch as you transfer” and “offsetted resumption of interrupted transfers”. Implementation strategies of these features with support for segmented and contiguous media assets are also disclosed.

主权项

1. A method of transferring a media asset segmented into a plurality of media asset segments, from a source device to a sink device, wherein the media asset is associated with a rights object having copy restriction data, the method comprising:
(a) establishing a move exchange key for the media asset segment; (b) receiving a command to transfer a media asset segment from the source device to the sink device; (c) determining from the rights object, if the transferring of the media asset segment from the source device to the sink device complies with the copy restriction data for the segment of the media asset; (d) if the transferal of the media segment asset from the source device to the sink device complies with the first media asset copy restriction data:
(d1) updating the copy restriction data of the rights object associated with the media asset segment;(d2) encrypting the media asset segment according to the move exchange key;(d3) transmitting the encrypted media asset segment to the sink device;(d4) updating usability restriction data of the rights object to indicate that the media asset segment is no longer usable by the source device; (e) repeating (a)-(d) for each of the plurality of media asset segments.