You can upload a specific file with a separate private key and then share the key. That way only people with the key will have access to the file. If you delete your copy of the key, it only remains with the person you gave it to.
It is not right to upload data that you do not have rights to and is not free for public upload. If you bought the data you can probably make a private copy.
This is a very good idea, there are 1-2 YouTubers that I enjoy and I will ask them for permission to make a copy of their videos on Autonomi so that they survive for future generations. Antvengers, Assemble!
There is no such thing, the user may have put it as metadata, but you can’t believe he didn’t lie. The closest we have is the AntChain idea where you know that a file was uploaded before another because each subsequent file points to the data address of the previous file in a continuous chain.
Check out the Impossible Futures!