Video distribution method, distribution device, and inspection device
A digital watermark is applied to a video to be distributed without re-encoding. A content distribution device 1 receives a content acquisition request to request video content, distributes the video content based on the content acquisition request, generates and distributes a watermark video with a watermark ID embedded, and causes watermark-video-related information including the watermark ID to be recorded, and a content playback device 2 transmits the content acquisition request, receives the video content and the watermark video, plays back and displays the video content, and superimposes the watermark video on the video content for playback and display.
1. A video distribution method comprising:
at a distribution device:
receiving, from a playback device, an acquisition request to request video content, the acquisition request comprising (i) a content identifier indicating the requested video content and (ii) a destination identifier indicating a device for playing the requested video content;
distributing, to the playback device, the video content based on the acquisition request;
generating watermark-video-related information based on the acquisition request, the generated watermark-video-related information comprising a watermark identifier, a generation time, the destination identifier, and the content identifier;
generating a watermark video embedded with the watermark identifier from the acquisition request;
distributing, to the playback device, the generated watermark video separately from the distributed video content; and
recording the watermark-video-related information in storage, and at the playback device:
transmitting, to the distribution device, the acquisition request;
receiving, from the distribution device, the distributed video content;
receiving, from the distribution device, the distributed watermark video;
superimposing the watermark video on the played video, wherein the watermark video is overlaid on the played video;
displaying, to a display screen, the played video content and the superimposed watermark video;
playing, on the display screen, the video content and the superimposed watermark video; and
fast forwarding or rewinding the played video content while repeatedly playing the superimposed watermark video.
2. The video distribution method according to claim 1 , wherein
recording, at the distribution device, the watermark-video-related information includes issuing the watermark-video-related information to a blockchain network as a transaction and recording the watermark-video-related information in a blockchain.
3. The video distribution method according to claim 2 , comprising:
extracting, at an inspection device, embedded watermark identifier from a video that has been suspected of having been leaked;
acquiring, at the inspection device, the watermark-video-related information recorded in the blockchain based on the extracted watermark identifier;
identifying a source of the leakage using the acquired watermark-video-related information recorded in the blockchain.
4. The video distribution method according to claim 1 , wherein a first time corresponding to a length of the video content is greater than a second time corresponding to a length of the watermark video, and
wherein the superimposed watermark video loops play each time the second time elapses while the video content is played during the elapsing of the first time.
5. The video distribution method according to claim 4 , further comprising:
at the playback device:
during playing of the video content and the superimposed watermark video, pausing the video content and the superimposed watermark video;
during playing of the video content and the superimposed watermark video, fast forwarding the video content and the superimposed watermark video; and
during playing of the video content and the superimposed watermark video, rewinding the video content and the superimposed watermark video.
6. The video distribution method according to claim 4 , further comprising:
at the playback device:
during playing of the video content and the superimposed watermark video, pausing the video content while repeatedly playing the superimposed watermark video.
7. The video distribution method according to claim 1 , wherein the acquisition request is an HTTP request.