At the end of the day, no matter what the delivery system of the Perl program is, a Perl program will become expanded into source code text somewhere in the filesystem and be compiled by Perl.

Active State does have a program, PerlApp which can confuse things quite a bit and make recovering the actual source code from an executable file difficult. "Difficult" does not mean impossible.

The Perl source code will be contained within a Perl executable file. This is not at all like a compiled C program.

It is certainly possible to encrypt/decrypt a file that is transferred between systems. And of course a Perl program could be such a file. Installing Crypt, although that installation fails, doesn't appear to have anything to do with the desired objective.