If you buy it on VOD, I don't practice, I suppose the recording is done on the hard drive of your computer.
Since I don't know the subject, I'm directing you to this tip: https://www.commentcamarche.net/contents/1492-la-vod-video-a-la-demande
After that, I don't know if the transfer, even when purchasing the film, from your computer to a multimedia hard drive (to play on the television) or a portable player for example is possible or not.
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Long live Bobo! ~ Little fish will grow big ~