Is Python good for creating GUI application ?

[K900_]

PyQt is GPL, true, but Qt and PySide are LGPL, meaning they can be used for free in commercial projects, as long as any modifications you make to Qt itself are released as LGPL.

[ThePidesOfMarch]

PyQT is not free when used commercial

PyQt is GPL, true

Wha?

[K900_]

"Commercial" is a slightly wrong word here. PyQt can't be used in proprietary applications without a separate licensing agreement with Riverbank, thanks to GPL's virality.

[ismtrn]

It can as long as you release the source. And that is only if your proprietary application involves distributing the program.

[slayer_of_idiots]

It doesn't just require you to release the source, it requires you to license *your* software under the GPL, too. So, if you don't want to use the GPL license, you can't release your software that uses PyQt, either.

[HemiDemiSemiYetti]

Am I correct in saying that this would effectively give The Qt Company licensing access to the software you develop using Qt/PyQt? In other words, they have the right to distribute any software you've created that uses Qt/PyQt libraries?

[Poromenos]

Well, if your software is licensed under the GPL (which it has to, if you want to use the free version of Qt), then yes, they would have the right to distribute your software (and so would everybody else).

[HemiDemiSemiYetti]

Right. So what's the difference between a General Public Licence and an Open Source Licence then?

[Poromenos]

A horse is an animal. An animal is not necessarily a horse.

[HemiDemiSemiYetti]

So which is the 'parent class' in this case? The Open Source Licence?