It would be good If we can secure our packages (mpk, lpk and gpk) with a password. If we can limit the time of a package like some other files can (PDF by example) and it can't be open after a date.
This would be a pretty cool little feature, but this could actually be implemented on your own through just about any scripting language, including Python.
AutoHotKey also has a nify little FileInstall function that will host the file and extract it to a directory of your choosing.
Try putting all of your files into into a File Geodatabase and then using the License Geodatabase tool to restrict access to it with a license file. This will give you a way to issue a license file for that Geodatabase and also set an expiration. Once you've done that, create your package from that Geodatabase.
When someone tries to open the package, I'd bet they'd need that license file.
