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You can unlock Spawn Protection for free. You can find and enable Spawn Protection in the Optional Features list of the app.
Spawn Protection protects players from building and fighting in a radius around the spawn point. You can define the radius yourself, by default players have to walk atleast 16 blocks to exit the protection. zone. Players can still be damaged by mobs and other effects in the zone!
Have a question about the plug-in Spawn Protection? Ask it on the forums here!