Commercial license vs LGPL license

[JovianGhost]

I apologize for creating another thread about this but after doing some reading, I'm still confused about the different licenses.

I plan to build a commercial app using Qt. After reading this thread (http://www.qtcentre.org/threads/28342-LGPL-question?highlight=commercial+license) it looks like I can write an app using the LGPL version of Qt and charge money for it, and I DO NOT need to distribute the source code to my app, as long as:

1) I link the app dynamically
2) I do not make any changes to the Qt source
3) I include a copy of the LGPL license/a link to the Qt source along with my app

So basically, the only benefits I see of having a commercial license are that I can link statically and that I can freely modify the Qt source to my heart's content without having to distribute anything else.

Do I have it right?

[Lykurg]

1) I link the app dynamically
2) I do not make any changes to the Qt source
You can make changes, but you have to publish them. (!= the sources of your application)

3) I include a copy of the LGPL license/a link to the Qt source along with my app

So basically, the only benefits I see of having a commercial license are that I can link statically and that I can freely modify the Qt source to my heart's content without having to distribute anything else.With commercial there is also bundled a support from Nokia.

[JovianGhost]

You can make changes, but you have to publish them. (!= the sources of your application)
And if I make no changes, there's nothing at all to publish.


With commercial there is also bundled a support from Nokia.
Of course, that's an added bonus.


Other than that, do I have everything right?
When deploying the app, do I have to include an actual copy of the LGPL license (i.e. this file (http://www.gnu.org/licenses/lgpl-2.1.txt)) or is it enough to say that this application is licensed under LGPL, and the provide a link to http://qt.nokia.com/ ?

[Lykurg]

And if I make no changes, there's nothing at all to publish.
Right.
Other than that, do I have everything right?
When deploying the app, do I have to include an actual copy of the LGPL license (i.e. this file (http://www.gnu.org/licenses/lgpl-2.1.txt)) or is it enough to say that this application is licensed under LGPL, and the provide a link to http://qt.nokia.com/ ?
I am not a lawyer, and beside: the LGPL is interpreted different in each country. I would ship a copy of the LGPL with my application. It has not to be in the root directory. The link to nokia is a must if you don't want to ship the sources of Qt itself with your application.

If you want to be 100% sure, ask a real lawyer. Otherwise: Nullum ius sine actione! (which means in English something like: no complaint, no redress)

[JovianGhost]

Great, thanks for your help!