Attacking trapped players
You are not allowed to engage PvP inside a public or a private boat. It is also illegal to engage PvP inside locked doors (i.e. locking another player inside your house to rob him). There always needs to be a way out.
Silent casting/whispering spells is illegal to use before an attack.
Attacking from a boat
It is illegal to attack other players from a boat with rites/spells/arrows/etc.
There are no looting rules for thievery or stealing (thief’s). If however a thief succesfully steals any items from your backpack or house, you may kill the thief, loot items listed as legal looting (weapons/armor/jewerly) from his corpse and anything else he has taken from your backpack/house.