He's talking about place COP, here are all the ways to avoid players placing COP
1. Give the beacons to player 12 as soon as the game starts, they will retain their color but not belong to players
2. Use disabled flag beacon sprites instead of real flag beacons.
3. Don't use flag beacons.
4. Have a computer player own the flag beacons (either given at start to p12 or just belonging to a computer).
5. Have a trigger constantly moving all flag beacons back to where they should be (only works well if you have 1 flag beacon, or you have a complex triggering system to return beacons)
Oh, and heres the thread that this was origionally discussed in
http://www.staredit.net/index.php?showtopic=23211&hl=