

you can have the source code, study it, improve it etc. Nuthin'" and the latter means "free as in speech" e.g. I can understand your confusion: most of the stuff released under the GPL is free and open-source, where the former actually means "free as in $0.

The usual "free as in free beer" and "free as in free speech" dichotomy. The fact that the source code is free and something is licensed as open-source doesn't make it automatically free of charge.

I don't understand why the full version of DOOM is not available for download for free when it is open-source.
