I noticed that my signature got less readable over time, but improved in unique characteristics which is a positive development in my opinion, since I never see a form without a field for first and last name and it's thus not necessary to identify me based on the signature which in the same time gets more unforgeable. It's definitely practical to have name fields on a form, but I was wondering whether there's a legal rule (probably a very general one) which requires a signature to be collected together with name data only in order to be valid (meaning to have the effect you intuitively expect after signing a contract or form).
Maybe there's a difference between contracts and forms.
I doubt that the law in Germany and the EU hasn't converged, yet, so I'm interested in the rules for the latter or both if there's a difference.
The question arose out of curiosity and to be able to be a smart-ass if someone ever annoys me because of the unreadability of the signature.