Comment by user34283
5 months ago
Afaik you can do whatever you like to GPL licensed code, you do not need a license to refactor it.
I understand you need to publish the source code of your modifications, if you distribute them outside of your company.
You can do anything except change the license, which ensures that right to do anything passes on to others in perpetuity. That's how it's designed.
You also can't relicense it to be less restrictive
Or more restrictive! There are certain exceptions permitting combinations of open-source code however.