1/ Click on the profile's Changes Tab,
2/ Scroll down to the entries for 21 February 2012,
3/ Notice the entry stating: “08:28: 08:28: Chris Whitten edited the Biography and Locked Status for Jane Davis. [Thank Chris for this]”
4/ Click on Chris' hyperlinked name to open his personal profile page,
5/ From Chris' profile, send him a private message asking him for the answer you seek.
The term “Locked Status” within a profile's changes log tell us the individual that locked the profile is the person that initiated the “Project Protected” status.
In the absence of a comment being posted upon the protected profile, I believe the only way to determine the precise reason for the status is to ask.