dupeguru/qt/ABOUT_LICENSE

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PyQt is used in this UI package, and PyQt is GPL software. I used PyQt before going releasing my
source as BSD, so I have commercial license. When I released this software as BSD, I assumed that,
BSD being incompatible with GPL, anyone wanting to redistribute this code would need a commercial
license from PyQt. Therefore, I had a warning here telling people they needed a commercial license
to modify and redistribute the qt code.
But no! There are good news. I saw that PyQt has special permissions in its "GPL_EXCEPTION.TXT"
file, thus making everything nice and shiny. The license of this software package is compatible with
PyQt's GPL license. No problem here.