This and some are some questions that nee users of YouTube may want to ask. Unfortunately, there is no solution to this. Videos, though they are not allowed to be downloaded on YouTube, but saved. They can be downloaded using third party applications, which YouTube cannot stop or limit the users from doing.
The only thing is to add audio reference that can be mentioning your YouTube channel names or watermark the videos. What else?
The only thing is to add audio reference that can be mentioning your YouTube channel names or watermark the videos. What else?