Perhaps a good way of protecting important files is to make them invisible instead of locking them. What if you forget the locations of the files you have made invisible? inVIZible lets you manage and organize the files that you have made invisible.
inVIZible’s Mode 2 lets you select a directory or volume to load. Then you can hide, unhide or delete a selected folderitem. Mode 2 can list files and folders that most other applications including Titanium Software’s OnyX can’t display.