I'm pretty sure we have many folks copying old projects which subverts some of the processes we have in place from request through to project conversion (and the custom forms connected). I know with 21.1 we can turn that off, so I'm debating that, but I was trying to see how prevalent it was first.
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I checked with our support team and it is not currently possible to check and see if a project was copied. This might be a good one for the Innovation Lab if you feel it's necessary.