Moin, I get "threats" that someone wants to upload my Twtich content to his YouTube channel and wants to make a fool of me there haha! Now my question, can he do that or does he need my "permission" to do so? Mfg Chris
If you report it (preferably with evidence), the video will not be online for long… You must not make any other person's material unauthorized, especially if your own face is shown.
No, he is not allowed to. This would violate copyright law.
If he does, you can report the video to YouTube so that it is deleted there. [Depending on the severity, one could possibly also take legal action, but in such cases it is often not worthwhile. Possibly. Most likely a warning by lawyer. But you don't have to exaggerate.]
