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In Germany there should not exist any problem, as far as you have a normal drivers's license without limitations and are able to control the vehicle in a safe way.
Why are you asking?
Ah, that is not a matter of your driver's license but of the status that you can park anywhere on special parking spaces with the disabled car.
You should take off the special parking permit when using the car.
The car owner should ask the police for the legal basis, why no other person is allowed to use the car.
Another person ist not allowed to use the blue or orange disabled card which gives certain privileges.
You should not tell anything the police.
They should tell the owner, on which legal basis they see a problem stating the law.
Then come back to me or a local lawyer.
At the moment I just cannot get quite the point of the police.