Margaret Gould Stewart in this video explains the copyright violation of new videos that are uploaded to youtube. She says that when a video is uploaded, its heatmap is checked for a match with all the existing videos. Each point is tried for a match with each other point so that if the uploaded video is a clip of the original, or has audio/video slightly slowed or fast forwarded, even then the two would get matched.
Unless, the user of original video has mentioned strict no copy policy, in which case a new upload gets immediately rejected, when an uploaded video is found to match with an existing copyright video, the user owning the copyright is given an option to deal with the video . The user might want to allow the upload if he sees a potential for advertisement/propagation.
She mentions an example wherein a video song released by Sony went off the charts in just a few weeks. Months later, a wedding video was uploaded featuring the same song. Now since Sony had the copyright to the song, they were given the option to either reject the upload or let it be. They allowed the upload, and put up advertisements and links to this upload from their page. Within weeks the video went ballistic and was watched by millions of people all across the world. The song was back in reckoning and it made to the 4th spot in the weekly charts!
Thinking about it, I do feel a bit of leniency can do good promotion of a video and should be the encouraged option.
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