Features:

• Small
  pLock takes only 21 KiB of your PDA memory.
• Hi-DPI aware
  pLock is designed in modern manners, it is ready for VGA displayes.
• Simple To Use
  It easy to use - tap to lock the device, tap and confirm to unlock the device. You can alose use a predefined HW key to unlock the device.
• Display Off
  Turns the display off when locking (configurable).
• Auto-lock
  The device is automatically locked after specified time interval. You can override this locking if the device is on external power source.

Please download here for Czech version.

Update Description:
v1.1:
- ADD: Auto-lock after minutes.
- ADD: Turning display off when locking.
- ADD: HW key to unlock the device.
- ADD: Localizations (English, Czech).
- ADD: do not lock device if on external power source.

v1.0:
- First public release.

*** [Apr 30, 2007] by Franco using M2000
Not tried this myself, but for those of you who are finding that any button will unlock it, this is a standard OS feature that can be turned off in in Settings/System/Button Lock.

** [Feb 19, 2007] by Glenn using hw6900
v1.1 Appears to have no effect on my hw6900 series. buttons and screen still active once locked ??

** [Feb 2, 2007] by clashcr using qtek s200
I have installed plock, but I still have the problem with the call buttons; with two presses, it dials the last number (last time it made up to ten times in one hour).

*** [Dec 28, 2006] by Senior Martoniki using Qtek S200
It needs some correction. I'm using Qtek S200. When I lock my device, phone buttons don't lock, usable.

**** [Dec 28, 2006] by Senior Martoniki, using Qtek S200
Very useful software. Thanks a lot.

*** [Aug 21, 2006] by Bary using iPAQ 6365
Nice but... it does not lock the most important keys like directions key and phone keys. They are the ones that get pressed when the PDA is in my pocket. So what's the use?

***** [Aug 14, 2006] by Raj using i-mate JAM
Had it for a week now and I found it to be a excellent piece of software.