qmake, qt and license question

[Alvin]

On Sunday 15 January 2006 01:08, kitts wrote:
> On Sunday 15 January 2006 05:59 IST, Alvin wrote:
> > On Saturday 14 January 2006 18:57, Jim Bodkikns (Dakotacom) wrote:
> > >    My question is: is it possible to use kdevelop and kdevelop designer
> > > without encountering the Qt license? (Commercial) What I am doing is
> > > commercial, but has less value than a single Qt workstation license :).
> >
> > I used to use Qt (for in-house apps) cause the look'n feel matched KDE
> > very nicely. However, I found the compile time too long; even for the
> > smallest of apps. I have since switched to FLTK (http://www.fltk.org).
> > It's lightweight, fast and its Plastic scheme looks great. AFAIK, there's
> > no commercial license needed as it's LGPL.
>
> Let me get this right... Does this mean that one can make proprietary
> closed source KDE application using KDevelop and KDesigner without having
> to purchase any license? At best i remember qt requiring a license for
> commercial use and KDE apps tend to use QT!?
>
> Or does this hold true if the application uses only the KDE API and never
> the Qt API? I am a little confused.

I may have confused things? I meant that FLTK doesn't require a commercial 
license. I checked again and FLTK uses the LGPL license with a few 
modifications (http://www.fltk.org/COPYING.php) that allow for greater 
flexibility.

AFAIK, anything created by/using kdevelop can be redistributed without a 
kdevelop license. This only applies to the KDevelop IDE not any libraries you 
use. In your case, QT has it's own licensing requirements. I don't know QT's 
full licensing details, but I do know that QT does require a commercial 
license to sell the app you create. I believe, and I could be wrong, no 
license is required to develop the app or if the app is open source. The 
license is only needed when selling the app (that uses QT).

As for the KDE's API, I'm not sure as I have never used the KDE API. I would 
guess that no license is required if the app uses the KDE API and the app is 
open source. As for a commercial app, I'm not sure if a license is required?

Alvin

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