correct - but they are non portable. Which means that all the nice features that Mac drivers have are not available on Linux (or the printing is screwed up, etc

correct - but they are non portable. Which means that all the nice features that Mac drivers have are not available on Linux (or the printing is screwed up, etc.). I wish there was some way to make portable/obfuscated filter drivers, so that vendors could ship them and be usable on all CUPS platforms.