Open source and free software are synonyms. They refer to the same category of software. RMS doesn't have anything against open source software. He's got someth

Open source and free software are synonyms. They refer to the same category of software. RMS doesn't have anything against open source software. He's got something against people de-emphasising the freedom parts of free software by calling it open source, but he doesn't think non-copyleft licenses are doing any harm.