How to obtain licenses or clear samples

Hello, I would love for someone to clarify how

some producers use samples or vocals from other tracks.

I see so many releases on beaport of unknown producers remixing famous pop songs or redoing old house tracks.

How do they do it? Do they all obtain licenses? or they just release it on some label in a third world country where copyright laws are not respected?

Please let me know

Thank you,

Yacine

i would say a lot just hope for the best… unless its generating enough money that it would be worth getting lawyers involved im guessing they just slip under the radar.