| http://www.w3.org/ns/prov#value | - ing stream ID to constitute the nullified data. [0031] In the method according to the invention, the rewriting step may comprise the step of re-encoding a frame next to the deletion end frame of the video data as a frame which does not require information of another frame in extension to nullify the video data to the deletion end frame from the deletion start frame, when the next frame is a frame
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