In his note, Stallman made clear the difference between Free and Open Source Software (FOSS) and open source as conceived by Eric Raymond and supporters in the business community. FOSS is not just "free as in free beer". Under FOSS software is free, not just for the user. The software itself has liberties. To Stallman, and to other FOSS advocates, this implies an obligation on the part of those who benefit from free software, which is to help the software grow, to contribute their additions back to the commons.