For the developers not aware, it is possible to encrypt the plist data of their stack add-ons, so that only the Stacks plugin and in future Stacks App is able to read it. I have extended the original script by @isaiah to make it possible to mass encrypt stacks and child stacks. Have a look here and let me know if you have questions.
Thanks, Jannis, that’s very helpful. I’ll certainly be making good use of that!
This would of course effectively disable the “optional upgrade” of stacks, that would bypass the need to have Stacks installed.