Grief Prevention

Instructions
When you place your first chest, you'll get an automatic land claim around the chest. You'll see glowstone and gold blocks on the ground, outlining your claimed area (those blocks are inside your claim). Place other valuable blocks like more chests, your furnace, and your bed within the protected area to keep them safe. You can use a piece of string (right-click) to check where exactly the boundaries of your claim are.

When you get a golden shovel, you can expand your claim or create additional claims (see the video above). Use /AbandonClaim to delete a claim you own, or /AbandonAllClaims to delete all your claims at once.

The simple claim sharing command is /Trust, which gives another player permission to build in your claim. /AccessTrust grants access to ONLY buttons and switches, while /ContainerTrust permits a player to access your claim and additionally open your containers (chests, etc) and use your crafting equipment. Use /UnTrust to revoke any granted permissions, and /TrustList to see who has permission.

You can permit another player to share his permission level with others by using /PermissionTrust. That player can't resize or delete your claim or use /PermissiontTrust on your behalf, but you should use this command sparingly because you may soon find that many strangers can access your claim. To clear away all permissions for all players in your claim, use /UnTrust all.

When you log out, you'll be credited additional claim blocks based on the amount of time you were playing on the server. You can spend those blocks when you log back in. If it's allowed on your server, you can buy claim blocks with /BuyClaimBlocks and sell them with /SellClaimBlocks. (not allowed on mbcraft.com) 

For you advanced users out there, claims may be subdivided so that you may manage permissions for different areas of your claim (think workshops, fields, and residential plots) separately. To get started, use /SubdivideClaims. You may resize subdivisions just like you resize your top level claim, and can delete a subdivision by standing inside it and using /AbandonClaim. To "evict" a tenant and all the friends he may have shared permissions with, use /UnTrust all. 

Player Command Reference
(See administrative details link above for admin commands and permissions.)