GTKmm for research/commercial use

[Riccardo <riccardo lucchese gmail com>]

Hi,

My name is Riccardo Lucchese. I'm a student at the Università degli 
Studi di Padova in Italy.
We are projecting the development of a new software for humanoid robots 
movements design.

I'have got a very briefe question: we want to close our source for 
competitive reasons and then sell it to support our laboratory; I have 
read the LGPL license but still something is not clear: at the moment I 
very basically inherit, for example, GTK::Window to create a customized 
window for my application, don't a brake the license if i close the 
source[as my derived class is actually a GTKmm class with some tunes]?


I thank you very much for you work,
hope to hear soon from you,

Sincerely yours,

Riccardo Lucchese.