PlayStation 3 homebrew developer MixeryMaxe has updated his PS3 password protection plugin homebrew application to PS3Lock version 0.9 followed by a v0.91 bug fix and v0.92 with the changelogs detailed below.
To quote: PS3Lock is an authentication-system for CFW capable PlayStation 3.
A personal password protects your PS3 against unauthorized access or gives you restricted access. XMB Settings, deleting of content files (apps/homebrews, game-data, video, music and pictures) and system update all can be locked.
PS3 Lock v0.9 Changelog:
Source: PSX-Place
Update: From MixeryMaxe: I have update PS3lock to version 0.92.
Download: PS3Lock_v0.92_+_src.rar (8.09 MB)
PS3 Lock v0.92 Changelog:
To quote: PS3Lock is an authentication-system for CFW capable PlayStation 3.
A personal password protects your PS3 against unauthorized access or gives you restricted access. XMB Settings, deleting of content files (apps/homebrews, game-data, video, music and pictures) and system update all can be locked.
PS3 Lock v0.9 Changelog:
- Added system update block for CFW 4.80 (thx to ermak86)
- Added support for all pad ports (1-7) and BD-Remote (thx to atreyu187 and stefa11)
- Added polish language (thx to darekspy)
- Added installer-pkg
- Fixed a bug that didn't shut down the PS3 after 3 incorrect password entries (thx to noctis90210)
Source: PSX-Place

Download: PS3Lock_v0.92_+_src.rar (8.09 MB)
PS3 Lock v0.92 Changelog:
- added system update block for CFW 4.81 (thx to ermak86)