Also i believe Ofelia allows to compile patch code into exe

@whale-av You are mixing things up again.

I can sell the Pd software for 50 $ and it is completely legal as it is under BSD license. If i can build a sustainable business model from this or even can find only one customer who pays me 50 $ for a software that is available without charge on the web is a totally different question

@ingox Agreed, but in this case, until they have handed over their project it has value, as it is not available for free.

@whale-av Well, if they have the code, but not a license that allows what they want to do with the code, they may be interested to buy such a license, which i believe was the original question

In such a case it could also make sense to pay the author to publish the code under a free license

It is also worth noting that an author can publish the same code under different licenses. So for example, if a software is under the GPL and i want to use parts of the software in my project, but i don't want my own code under the GPL, i can contact the author and ask her, if she would also release under a different license, maybe even pay her for that

Not possible however is to revoke a license that is once given. So if my software is out there under the GPL, i cannot undo this. (Maybe there are commercial licenses that allow revocation, but i am not aware of any.)