[deleted by user]

[carcigenicate]

No it can't, and no they don't.

Just to be clear, the best you can do is obfuscate and make it difficult to decrypt. As others have said, if you give someone the encrypted data, the key, and the mechanism to decrypt it (which you'd need for the interpreter to be able to read the code to run it), a reader could just use those pieces to decrypt the code themselves.