proprietary programs

FSF.org: "If they distribute the exact same code under a different license to certain users that pay for this, typically permitting including the code in proprietary programs, we call it "selling exceptions"."

Cyber Cynic: "Canonical, the company behind Ubuntu, arguably the most popular of all Linux distributions, is asking its users what new, proprietary programs they'd like to see as optional software in Ubuntu."

Technology & Life Integration: Fiction or Future: "You could say that the software world is divided. There are 10 types of software philosophies.

Those that are closed source and those that are open source. One thing I have noticed is that where there are cross platform programs there is a difference between the closed source and open source implementations."