User talk:Magnushubner

I would agree that "secret" and "physical characteristic of the user" would imply uniqueness. However, with "physical objects", I am not so sure there is a clear implication. E.g., a "key", as given in the example, can be shared. I have also found it fairly common that physical access or network access is seen as a "physical object", even though the access is shared by several people. Stating that the factor needs to be personal would add clarity to such cases, I think, but perhaps a comment is only required for the "physical characteristic"?