With Lockette you can protect the contents of your containers from being stolen.

Lockette can be used on:
Chests
Furnaces
Doors
Trapdoors
Brewing stands (rank dependant)
Droppers (rank dependant)
Dispensers (rank dependant)

How to use lockette:

Chests, furnaces, brewing stands, droppers, and dispensers:

Crouch and place a sign on the block to protect it instantly.

Alternatively, place a sign in front of the block and type [private] on the first line.

Doors:

Place a sign above a door and type [private] on the first line.

Alternatively, place a sign in front of a door and type [private] on the first line.

Trapdoors:

Place a sign on the block above a trapdoor and type [private] on the first line.

Adding more users:

Sometimes you want to allow your friends to access your chests, or be able to go through your doors.

To add up to 2 other people to a container, enter their usernames on the third and fourth lines of your Lockette protection sign.

To add more than 2 other people, place another sign on or next to your container.  Type [more users] on the first line, then your friends usernames on the other lines.

Editing existing signs:

You can edit your signs either using Lockette or SignEdit.

Lockette:

Right click one of your protection signs to select it, then use /lockette <line number> <text> to edit.

SignEdit:

Use /signedit <line number> <text>, then when prompted left click the sign you want to change.