Billy has created a device called a trailboard. it is essentially a skateboard with two pairs of large, relatively soft wheels, designed to be used for descending hiking trails. the wheels are similar to those on other skateboards and are mounted in the same way, but are simply larger in diameter and have a knobby tread. billy made his first trailboard two years ago, and has made several more over the past couple of years in attempts to perfect it. he has given several of these to friends in order to get their feedback and suggestions. billy wants to obtain a patent for the trailboard, and a trademark for the name trailboard. he is worried about the patent because a friend told billy that she had seen a similar device on a trail recently. billy wants to obtain a copyright for the book he wrote on trailboard techniques. discuss billy's legal situation.