Is there a way, using DVD Architect or any other program, to produce a DVD that cannot be copied?
No. DVDA can put the Flag in for copy protection but that only works after it has been commercially pressed. Even then, there are very few DVDs that can't be copied by some method. The best you can do is plaster copyright on the beginning and any other place on the DVD.
@DOT Thank you for the super quick response. There seem to be a number of programs online advertising they can add some sort of encryption to make the DVD copy proof. I don't think pasting copyright notification everywhere will deter those intent on copying.
Encryption doesn't stop it either unfortunately. Good luck. The best copyguard I have found is when an error is encoded in the disk. I don't know how that is done, but I have run into a few commercial DVDs that have this protection.