Ok, i contacted the author again and he agreed to change his license to something in agreement with his thoughts (which were: GPL, and also permitted to link with Qt commercial WITHOUT restrictions !)
So the final license is: GPL, with an explicit exception allowing linking with any version of Qt without having to redistribute sources of Qt. (that is the license of psi package) Modifications and redistributions are explicitely permitted, so now I believe that this thread can be ended. Thanks to all for their suggestions, and to the esvn author for his efforts. Regards, Pierre
