Licencing FAQ
After this FAQ it’s adviced to also check Free Software Foundation’s GNU License FAQ.
1. If changes are made to GPLv2 or GPLv3 -licenced product, but it’s not distributed, does the source with changes need to be published?
No.
If the product is only used inside a company, the clauses concerning the distribution of licence are not applied and it’s source does’nt have to published. For this it doesn’t matter if the product has been changed or not.