I installed this, and while I didn't have anyone to try this out with, here are some observations.
1 Why does this hack need -2- Preference Panes? Prefpane #1 (The on-off switch) is simply that. This should not be in PrefPanes, but in iChat itself.
2 The 'Net Update' Pref Pane does more of a service for Intego than the user. There are -2- checkboxes for 'Opt-in Spam' from Intego. And -why- do they need an email address -and- password for the updater?
All in all, this comes across as some marketing flunkys idea that should port from Windows. It's obvious that Intego doesn't know how to integrate with MacOSX. So, to recap;
1/ Put Settings and functionality for the app you are enhancing IN THE APP ITSELF -- NOT IN THE OS. If you need a primer on how to do this, look at the FREE sofware PithHelmet with its Safari integration.
2/ If you expect to receive $40 for your hack, don't add insult to injury by bloating our systems with extra flotsam like 'Opt-in Spam' in the Net Update. That is just plain insulting.
To top off what others have been saying about how Apple may just have this functionality in the next one anyway (it's SSL, and Windows folks already have it), Bitwise and Fire have encryption capabilities for FREE. Also, if you really NEED crypto, PGP also has an Encryption service built into the service menu. You can encrypt text to your chat partner's public key and -know- that its meant only for them (and is not just some SSL stream).
In short, if you're willing to do some homework, don't fall for this Windows vendor's price taking. Learn about other alternatives for the Mac.
That being said, at least it comes with a de-installer.