I'm a Haskell newbie but long time open source developer and I've been
following this thread with some interest.
The GPL is not just a license - it is a form of social engineering and social
contract. The idea if I use the GPL is that I am releasing free and open source
software to the community. You are welcome to use it for any purpose but in
exchange you must also agree to release any software you create that uses my
software as free and open source.
That is the difference between GPL and BSD type licenses. The GPL very
deliberately creates an obligation. Yes, that can be inconvenient. It is meant
to be inconvenient.
Actually the GPL reminds me of a Haskell concept that I am struggling with
right now - the monad. When I started writing Haskell code I was always trying
to mix pure and IO code and I soon learned that once I used the IO monad I was
stuck within it. The monad creates an inconvenient obligation and any IO code
can only be used within other IO code. There are good reasons for monads (just
as, in my view, there are good reasons for the GPL) but using them means that I
need to make a lot of changes to the way I write software.
Kevin
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