from Torch:

Lockdown In-Game will require you to enter a password when you resume your PSP from suspend mode. Useful to prevent other people from messing up your progress if you put the PSP in suspend during a game.

Installation:
Put it in the ms0:/seplugins/ folder and make an entry in GAME.txt (e.g. ms0:/seplugins/lockdown.prx).

It is recommended that it should be the very first entry in GAME.txt (How ever if you also have Hold+ installed, then make Hold+ first and lockdown.prx second).

Use the included exe to create a password file (buttons.ini) and put it in ms0:/seplugins/

If you also have the flash0: version of Lockdown installed, then this will detect and use the same flash0: password.

It only works in GAME mode. It will not work in the XMB.

Notes:
I have only tested it with few games that I have. Its recommended that you don't suspend the PSP while a game video is playing as sometimes it doesn't work properly during video playback.

While in the password screen, press Select if you want to suspend the PSP again without typing the password (the power switch won't work in the password screen).

Changelog v1.1
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Optimized the code a bit.

The PSP doesn't automatically suspend after entering a wrong password. You can now press Select while in the password screen to suspend the PSP.