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ray.foulkes@shay-mwa.com 7 jaar geleden
KiCAD is distributed under a GPL V3 licence, so it is open
source, which means that all the code making it up may not
be subjected to copyright.". It is perhaps not the authors words, but it is essentially wrong.
GPL V3 is a copyright claim and all items released under any GPL has a very strong copyright protection. That means that whoever requires to re-distribute the software must obey the original copyright holders requirements as set out in the relevant version of the GPL.
That being said, the GPL is a very permissive licence i.e. all recipients can use, modify and re-distribute unchanged or modified versions BUT SUBJECT TO RULES. For example, you cannot change the copyright permissions and all changes have to be under the same copyright rules - amenders must permit all their amendments to be used (and modified) in a similar manner to the original.
So in summary GPL is a strong copyright claim by the author(s) to protect the software from being pirated under a different copyright licence.