Hey man, here's a good rule in regards copyright:
Did you make it?
if NO - you aren't legally allowed to upload it and/or use it. The only way you can use it is to either 1. wait until it falls into the public domain (30-60 years depending on where you live) or 2. obtain the rights from the copyright holder. (note that I did not include fair use here since I'm not sure of its applicability in what you're doing).
if YES - happy watermarking & uploading.
You do not need a copyright symbol (©) to protect your intellectual property, so if you want to reuse certain videos you cant simply feel free to copy works just because they don’t have a copyright notice. I guess you could message the holders and perhaps make a rev-share agreement for licensing their videos, although I don't think you'll have much luck.
Taken from xvideos section on piracy:
Please note that Xvideos specifically reserves the right to pursue damages, costs and legal fees available by law in the event a copyright owner or a user submits a copyright infringement notice or counter-notice without a good faith belief regarding the infringing or non-infringing nature of particular content, or to the extent an individual submitting a notice or counter-notice makes any material misrepresentations to Xvideos.
Note that I'm not a lawyer, so don't take my word as legal advice. If I were you, I would research 'fair use', 'DCMA', 'video licensing' and find content regarding this specific industry and/or your national laws. Please note that international treaties may make this process very difficult for you.
