At it's most basic, I see the limitations on Offence and Defence as such.
Defence: If Great Justice or the Space Patrol can not get through it, it's illegal.
Offence: If you can breach the maximum Defence allowed and you're not Great Justice/Space Patrol, it's illegal.
Defence: If Great Justice or the Space Patrol can not get through it, it's illegal.
Offence: If you can breach the maximum Defence allowed and you're not Great Justice/Space Patrol, it's illegal.