|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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An anti-theft charm (incantation unknown), also known as an anti-theft device, is a charm that prevents Summoning the charmed object by anyone but the object's owner. For security purposes, most magical objects sold in modern times are enchanted with such a spell.
- Wonderbook: Book of Spells (Mentioned only)