Buying Tickets From StubHub.?

Hello I just bought tickets from stubhub and I have two questions. Firstly do concert venues accept photocopied tickets in place of a normal ticket. Stubhub uses third parties that sell the tickets so I want to make sure that my tickets are legitimate. Secondly is there anyway for me to call the venue and request that they do not give em replacements so I am not screwed out of tickets? Thirdly can you please give me any other general knowledge with bought tickets from third parties. Thanks!