The average English speaking American probably won't be able to make sense of someone speaking Haitian, nobody says everyone must be able to understand you.

But you can record the Hiatian speakers message and get it translated.

With sufficient encryption, recorded messages cannot ever be decoded unless the key was broadcast, which it never would be.

> But you can record the Hiatian speakers message and get it translated.

However, this exact form of encoding was used as a form of encryption while the US was at war; the Navajo Code Talkers.

Somewhat off topic, of course, but a great example of how encryption and encoding can have identical end results.

You can record an encrypted message and get it decrypted by anyone who demonstrates knowledge of the key. The process is identical to finding someone who demonstrates knowledge of Haitian. Encryption is nothing more than an uncommon encoding.

Analog video signals are pretty distinctive, anyone with an oscilloscope could recognize them.