[@zaerl Participant 16 years, 4 months ago]

It was just a correction. It’s fair to sell GPL software. If you, the developer, choose a copyleft-like license as the GPL you know what other people can do with your code (and what they can’t.) Basically speaking you put your work in the public domain with the only difference that others can use and distribute your software under the terms and condition of the GPL. If you don’t want other people to make money with your work than you can choose a more restrictive license like the Creative Commons Non-Commercial.