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From Pathfinder Core Rulebook, which isn't enabled.

Secret Page

SPELL 3
Traditions arcane, occult
Cast 1 minute
Range touch
Targets 1 page up to 3 square feet in size
Duration unlimited

You change the target's text to different text entirely. If the text is a spellbook or a scroll, you can change it to show a spell you know of secret page's level or lower. The replacement spell cannot be cast or used to prepare a spell. You can also transform the text into some other text you have written or have access to. You can specify a password that allows a creature touching the page to change the text back and forth. You must choose the replacement text and the password, if any, when you Cast the Spell.

Pathfinder Core RulebookOGL