( I havent looked in the IS yet. )
You want this:
201541 Equipment Lock
"Lock a wearable item. Once locked, the item cannot be exchanged, traded, refined, disenchanted, abandoned, have its runes changed, or be used as ammunition. Use Equipment Release to unlock."
And to reverse it:
201542 Equipment Release
"Used to unlock items in the backpack that have been locked with an Equipment Lock. You will need to enter your secondary password."
You do NOT want "Equipment Sealing Device". This item prevents only PVP-drops , we do not have PVP servers anymore. It is useless nowadays.