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I would like to protect a video file (can be any format, avi, wmv, mkv) Something like, user should only be allowed to view first 10 seconds of video or a another video clip showing link to site where they can purchase a codec to remove DRM and watch whole video.

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Nobody is going to buy and install a codec to watch one video. – Phoshi Nov 10 '10 at 23:01
Do not ever underestimate anything brother. Anyways, thanks for sharing your belief, but i will still try. – Anil Dewani Nov 11 '10 at 17:27

You can make "preview videos" that have a screen with a URL that people can type into their web browser to sign up and download the full version, but there is no video format that supports partially encrypted streams.

So, to do it, you would need to write a codec that would allow this, which people would have to install to watch the preview, as well as a whole DRM infrastructure. And most people wouldn't install the codec for the preview, and the pirates would just pull out the rest of the video stream and watch it/upload it somewhere.

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