From what I understand about Shakespeare - which isn't a lot - there was no copyright law when he was writing. He sampled at will, and it wasn't seen as a bad thing.
Mike PosnerSo I'm in the library, and I have keyboards out and my headphones out. Everybody's like, "Mike are you making beats right now?" and I'm like, "Yeah... sorry!"
Mike PosnerMost people go to college to get a job, and here I am sitting in class with a job, making exponentially more than whoever's teaching me, you know what I'm saying? At the end of the day, I wanted to finish what I started, and make my mom proud. A lot of people put a lot of hard work and investment to allow me to go to school, and for me not to finish would have been like a slap in the face to my family and those people.
Mike Posner