Lockdown allows you to password protect your PSP from prying eyes.
It also protects the Recovery Menu so that the protection can’t be disabled without considerable effort, such as writing a VSH mode plugin to uninstall it from flash0, or by unbricking with Pandora.
AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)