What happens in the case of forks? If I decide to fork some open source software under this license, make a bunch of changes and start selling it under this li

What happens in the case of forks? If I decide to fork some open source software under this license, make a bunch of changes and start selling it under this license, what do I owe the original authors? Now how about if the changes were minimal or amounted to a complete rewrite? I'm not really sure that I can think of a way to have a license like that which doesn't rapidly become overly complex when forks are thrown in. And if the freedom to fork is taken away, I don't think that I would consider the license to be free as in freedom.