The mark consists of a white stylized castle or fortress tower with a flag on top with a blue background. The central element of the tower is a keyhole. Below the tower, there is a light blue chevron shape pointing downward. The tower is white in color, and the chevron is light blue, to the right of which is the white stylized wording "BLUE GUARDIAN" all of which is set against a dark blue background.
The color(s) white and blue is/are claimed as a feature of the mark.