Hi,

If you create a protection that overlaps other's player protection, you can place pistons and move other player blocks with them. This leaves pstones almost useless beacuse everyone can enter your protections.

EDIT: Protections dont needs to be overlapped, so 'dont overlap' flag does nothing.

If you try to move a protected block (another player, not yours) with pistons (sticky pistons too), it does nothing. But if you create a protection around the piston, that piston WILL move that block, even if the 2 protections are from different players.

Yep but only if the owner of the field is allowed ont he other field.