Safeguard is an ability of the Chemist class, learned for 250 JP. All the equipment of the unit equipped with this ability will be impossible to remove, whether by stealing or destroying the equipment. It is especially useful against Knight units that frequently use Arts of War techniques.
Maintenance is a support ability learned by the Thief and Alchemist from the Adaman Vest for 300 AP. It prevents breaking and theft of equipment and prevents theft of gil, Judge Points, Experience Points and abilities.
Safeguard is a support ability learned by Thieves and Alchemists from the Adamant Vest and by Vikings and Raptors from the Iron Armor. It prevents breaking and theft of equipment and keeps gil, items, loot, and Smash Gauge from being stolen.