Licence on client computer

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Hello,
one of my clients is worried that he will receive penalty from state inspectorate because he has installed TeamViewer without licence.
He use it only for inbound connections, our company give him support and we have Premium licence.
I checked your knowledge base and community posts and I'm sure that he do not need any licence.
I'm not sure what version he installed (full or QS or host) but if I understand well that is not important?

Is there any official statement from TeamViewer company that he can show to state inspectorate and prove that he don't need licence in this case?
 
Best regards,
Toncic Linardic
Adria-Electronic Rijeka