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I am not trying to question delivery methods in general - I had an Amazon delivery the other day where the "proof of delivery" was a photo of the parcel on our doormat, which is protected from the elements by the front porch - fine. What I am questioning is the validity/legality of the "signature". As aelmpvw says, touchpads make it difficult to produce anything recognisable, but what proves it is your signature, or conversely how would you prove it isn't? With thumbprint recognition available on (some) mobile phones using the same technology for deliveries would at least involve something that could be tied to an individual if needs be.