I'm about to launch a compilation-themed channel (lets say its about cats for better understanding), and I need some advice. 1.The videos in the compilations are not owned by me. Should I ask each and everyone's permission to use them (If I'm correct, this is the only legal way if I want to earn money from compilations)? Will it help if I get a few permissions (of the total lets say 10 videos i use in the comp)? 2. If I make some changes to the original videos (e.g. invert them) will it make my compilations safe from copyright issues? Do you have any additional advice? Thx in advance.