The color(s) Black & Yellow is/are claimed as a feature of the mark.
The mark consists of The word "THE" in all capital black letters rotated left 90 degrees. The word "Lock" in black letters contained within a yellow padlock laying on its side, whereas the "L" forms the bottom and right side of the padlock. The word "Doctor" in black letters whereas the "D" is formed from the shackle of the padlock and the remaining letters continue in left to right fashion..