Iirc the whole chain needs to be licensed and copyright transfered, that's to avoid issues with people laundering pirated items with a legit contract knowingly.

So the issue remains if they knew the wendir hadn't a license - that'd be necessary to know where to assign damages, but still they would not be able to use the output, as created without a license to begin with.

If the vendor had not a license to work with the software the output has been illegaly obtained, while claiming copyright on the output may not stick claiming a royalty along punitive damages is not that far fetched.