Future Mask Off - "Prison Song" Sample clearing?



Tommy Butler - Prison Song

has been used in Future - Mask Off.

1.do you need to clear such samples before using them?
how do you do it?

2.are there samples out there that dont need to be cleared anymore? (because of time…)
where do I find them?

3.producing a beat with a sample without clearing it … plus selling/leasing it may get u into trouble right?
at the same time: doing that and having a hit will make everybody sharing the royalties (artist of the original, labels and so on, right? thus makes everybody happy, right? :wink: