Kind of reasonable though, you should be mailing links.
Depending on what I'm working on sometimes I am not permitted an electronic copy, a hardcopy with every page watermarked with my name is couriered to me so that I cannot email it. Othertimes everything is on a secure VPN to which I can neither add or remove anything.
Ultimately though if someone wants to intentionally beat the system it's close to impossible to stop them. It's usually someone introducing something by mistake which is the weakpoint.
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