The idea of copyright did not exist in ancient times, when authors frequently copied other authors at length in works of non-fiction. This practice was useful, and is the only way many authors' works have survived even in part.
Richard StallmanPrior art is as effective as US soldiers in Iraq: They control the ground they stand on, and nothing more. I used to say Vietnam, but, well, you know.
Richard StallmanI have not seen anyone assume that all the citizens of New York are guilty of murder, violence, robbery, perjury, or writing proprietary software.
Richard Stallman