Mixing Licenses ... any hints needed

[Wolfdieter Schmidt]

Newsgroup,

I am currently planning to write a program which uses Trolltech Qt 4.

And I will use the Qt4 - GPL version. So as I understand my code has to
be GPL.

No problem so far.

But like every modern GUI, I need icons, buttons and some tiny pictures.

Now the question is: Can these icons/pictures/graphics be licensed in
any other way, can these graphics hold a copyright of some company? Or
am I forced to just use GPLed graphics?

Thanks
Wolfdieter