This VI is a template to make a password protected LabVIEW front panels and block diagram. 

This VI allows three levels of access: user, engineer and programmer. Users can start and stop the main portion of the VI, but cannot change front panel control values, view the block diagram, or edit the VI. Engineers can start and stop the main portion of the VI and change front panel control values, but cannot view the block diagram or edit the VI. Programmers have full access to the VI, including the front panel, block diagram, and VI properties. For user access level, enter userpwd. For engineer access level, enter engineerpwd. For programmer access level (full access), enter programmerpwd.

Note: You must be logged in as a programmer to access the Logout & Exit button, which is the only way to stop the execution of this VI.

You have to restart LabVIEW to reset the password settings(once you unlock the block diagram, its unlocked).