One thing that occurs to me is that it isn't, as far as I know, really possible to obfuscate a deck and stop people from poking around at its innards. Since a .deck is basically just a text file it's not hard to open it up and look at code or indeed change it to "unlocked".
Obviously that's something they'd have to explicitly choose to do instead of stumbling upon by accident but it may be a consideration, depending on what you're doing.