Seems like it could be useful to others, so here you go.
This one helps you to stop foreign players destroying stuff on your server.
It lets the admin manage a list of players who are allowed to build and destroy.
All others can connect, walk around and have a look at your buildings but that's about it.
Trustlist
let's you decide who can build and destroy stuff on your server
Only admins are allowed to add/remove players from the trustlist
Commands
- /trust <player>
Trusting a player. Player is now able to build and destroy
- /untrust <player>
Removes player from list. Player can't build and destroy anymore
- /trustlist
Prints the entire list of trusted players and the admin who added them
Untrusted players are unable to perform the following actions:
place,remove or destroy blocks,constructions,objects,chests and vegetations
pickup vegetations
drop or take items out of chests
put items into chests
place or destroy terrain (dirt,stone...)
mowing lawn
hitting or killing other players or NPCs
Once you are added to the list the script doesn't affect you anymore.
NOTE: Even admins have to be trusted before they can do stuff, but they are able to add themselves.
Thanks to the guys from (HS) Hessenstrolche server for testing this script! 
So if you want to see how it works out, visit them. Their buildungs are worth a visit anyway 
Enjoy
