Mediaword Compression for Network Digital Media Recorder Applications

摘要

In response to receiving from a subscriber both a request to record content and a unique requester key, a network DVR identifies an asset associated with the request. The network DVR segments the asset in to a series of segments, assigns a mediaword to each segment for compression, encrypts each of the segments using an encryption key, and records the encrypted asset segments in an encrypted dictionary storage as definitions, i.e., dictionary entries. The encrypted key and the mediaword are forwarded to a requester handler flow in the network DVR that generates requester-specific encrypted copies using the requester key received from the subscriber. The mediaword, encrypted encryption key, and the encrypted asset segments are stored in and retrievable for the corresponding requester.

主权项

1. A network digital media recorder comprising:
an input for receiving requests from a plurality of requesters to record content, wherein each of the requests to record content includes an identity of the requested content and a requester-specific encryption key, a processor for forwarding the identity of the requested content to an ingress and for forwarding the requester-specific encryption key to a requester key handler; the ingress for receiving media content and identifying one or more media contents that is associated with the requests to record content; a compression dictionary creator for:
for each of the associated one or more media contents, encrypting segments of each media content using a variable encryption key generated for each segment;assigning a mediaword to each of the encrypted segments; the requester key handler for, for each of the plurality of requesters and for each requester's request to record content received at the network digital video record:
identifying the encrypted segments that correspond to the requester's request to record content, andencrypting, using the requester's requester-specific encryption key, each of the variable encryption keys used to encrypt each of the encrypted segments that corresponds to the respective requester's request to record content, and a requester content storage for storing each of the requester-specific encrypted variable encryption keys and the mediaword assigned to the respective encrypted segments.