> I surmise that there must be at least a couple of countries where a marriage certificate is nothing more than a plain sheet of copy paper with something along

> I surmise that there must be at least a couple of countries where a marriage certificate is nothing more than a plain sheet of copy paper with something along the lines of "I hereby declare that X and Y are married" in their local legalese. Aside from using something other than “copy paper” and added ornamentation, this could describe all of my US legal documents including my marriage and birth certificates.