In a game project i've been working on, Quake3 BSP files are being imported into the engine for further editing These BSP files have been generated by Q3Radiant, which, as I understand, is available under the GPL license.

The GPL license reads:
Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does.
What i'm trying to figure out, is if I'm able to use these BSP files, which are the output of Q3Radiant, as a part of a commercial project?