How can one hide the scripts for an editor extension? I assume there is a way to distribute an editor extension on the asset store without giving out the source code, but how do I make sure the end user can’t see or edit my code?
Is it also possible to put a script on a game object, but make it unreadable as well?
It’s not possible, so don’t waste time worrying about it. Even if you distribute a DLL, it’s fairly trivial to decompile that, and while it’s not as good as the “real” source code, it won’t stop anyone who’s determined to poke around in your code. Also, a lot of people will refuse to buy any utility unless it includes the source code.
You could use an obfuscator. Customers will still have access to your code, but it will be hard to read.