The creator gives permission for others to use this in their own Level Kits and etc.
The Weapon System is an update available for LittleBigPlanet made by Twenty-Second Choice, that is automatically installed with the Mega Man and Kirby Kits. It is an extension of the Paintinator, which contains multiple different weapon objects that can be picked up and shoot objects; they can also be tweaked to create a custom weapon.
Robot Master Weapons
In the Mega Man Kit, defeating a Robot Master gives you the ability to use their weapon (by using Eddie, located next to each Checkpoint). A description of each weapon can be found on the Robot Master's page.