Software Licensing

Hello all!
I'm developing my first commercial software for WinXX plataform, and I have some doubts about the compiler license.
I'm currently using the old Borland C++ 5.0 IDE (unregistered) and learning OWL. Is that ok to develop my commercial program using the bc5 w/o pay for license? and about the OWL? can I write a commercial software using OWL whitout pay for any license? well...since Borland C++ is not available anymore and the compiler is free....
I didn't really understood the Borland license agreement.
A friend told me to use the QT (trolltech) library but I cannot sell my software using the free version of QT.
What should I do? get a free compiler like djgpp?
I really could use some advice and I don't want put my foot out of the law.

note: as you can see, I don't know mutch about software licensing, so, any help could be usefull.

Thanks,
Jester

Hmm...I don't use Borland, but I'm pretty sure you are going to have to get a license.

Would be any problem if I use a free compiler? do you know any that support API?

Borland still sells IDEs, actually. They do fairly well with it, I understand.

As I understand it, the license agreement states that if you use their IDE, then you gotta pay. Not their compiler. Use any freeware IDE out there and plug in Borland's free 5.5 compiler, then use OWL and anything else it comes with to your hearts content.

Or go with plain old Win32 API and any free compiler/IDE (like Dev-C++/mingw32).

Thanks!!!