I am aware of that. Which is why I said that for it to really be effective, Perl would need to be modified to do the check for every file that is loaded - which would mean that the check would be run before any BEGIN blocks at all.

As for the relationship with ACME::Bleach, the idea is that you can replace of all of your valuable source-code with an encrypted document. This could be decrypted by the correct module and a public key. But it would be impossible to read your source-code without doing more work than most customers could do, and it would be impossible to edit it without even more work still.

Yeah, useless against knowledgable programmers. But still you could impress the PHB...