Deepsound

DeepSound might be used as copyright marking software for wave, flac, wma, ape, and audio CD. DeepSound also support encrypting secret files using AES-256(Advanced Encryption Standard) to improve data protection.

kinda remember playing with this when i first got a windows machine all those years back, of course then i used to walk around with a bag full of rainbow 3.5" floppies and novell netware supervisor approved calls via the hosted modem to bbs systems in sweden. it was a different time back then -- i think this would be cool to use on your modern day podcasts! :)