This curse is often placed upon forbidden tomes that are protected from destruction. It affects not just the cursed object, but all text the victim subsequently encounters.

Type curse; Save Will DC 20

EFFECTS

The target of this curse must succeed at a DC 20 Linguistics check to comprehend any written material. On a failed check, the victim can't understand the written material for 24 hours, at which point he can attempt a new check. The victim can't prepare spells from a spellbook or formula book, scribe scrolls, benefit from a magic tome, or research new spells on any day he fails the Linguistics check for the relevant written material.