So, we will be given mkv files that are to be sent to multiple client sites. We need to encrypt the contents of those files prior to transmission, but in a way that the client can begin to playback those files, decrypting them on the fly. We know we can simply encrypt the file itself, but then the client would have to decrypt it prior to playback, leaving the unencrypted file open for pilfering. Have been googling for encrypt mkv but have not yet turned up anything. Is this possible to do? A library to accomplish this (Windows encryption side, Linux playback side) would be ideal but a cross-platform app would suffice in a pinch.
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There aren’t standard DRMs. But you can use standard crypto, You don’t want to encrypted the entire file, just the video stream inside the container with a stream cipher, thus you can hook in at the parser level in whatever opensource MKV library you are using to then decrypt the chunk of the stream before it passes it to the codec. You’ll want a choose a standard stream cipher that is fast and will let you skip to later places in the stream (e.g. Salsa20)