Sam Williams, Free as in Freedom (2002) — Chapter 9… (2002)
“ Now, with programs moving over to the GPL, Morin was suddenly getting his tapes put together in half the time, turning a tidy profit in the process. Sensing a commercial opportunity, Morin rechristened his hobby as a business: Prime Time Freeware.Such commercial exploitation was completely within the confines of the free software agenda. "When we speak of free software, we are referring to freedom, not price," advised Stallman in the GPL's preamble. By the late 1980s, Stallman had refined it to a more simple mnemonic: "Don't think free as in free beer; think free as in free speech." ”
