Features:

- Block plugin visibility,
- Block //calc, //eval crash.
- Customizable error message,
- Customizable title message.

Requirements:
Skript,
SkRayfall (for title) (Not really needed).

Permissions:
No permissions! It blocks access to everyone!

If you want to turn it off / on:

/sk enable scriptname.sk - Enables the Script
/sk disable scriptname.sk - Disables the Script

If you want even more protection, search in spigot.yml for tab completion and change it's value to -1