That sounds sensible... sounds like I can probably do nothing for now (but I'm worried they're going to progressively lock things down harder in the future... this isn't going in a good direction!)
M
Again, that adds credibility to a system that adds little more than a pain for users, and it distracts everyone other than bureaucrats. Most users just want to download and run your software.
If a school sysadmin wants to misunderstand security and force instructors to go through the hoops, then the school or, at worst, the instructor should pay you to jump through the hoops and get a signing key. The end user shouldn't even be aware of any of this, other than maybe seeing a link to the _trivial_ workaround katja mentioned next to the version you currently have available.
-Jonathan