It signifies you have read the info here on working on pre-1700 ancestors, have taken the little quiz, and by doing so, confirm you will your best to adhere to the guid-lines set for persons born, residing or passed away pre-1700. This would include proper sourcing, and checking for dupes to limit the number of 'Richard Warren, Mayflower Passenger' entries to the one true and communally worked on person.
(I think I said that short enough :) )