Simplify the following text for a Grade 3 native English-speaking person.
Original: Even though the copyright on Tarzan of the Apes has expired in the United States of America , the name Tarzan is still protected as a trademark of Edgar Rice Burroughs , Inc. .
Simplified: Edgar Rice Burroughs first wrote about Tarzan in 1912 . The book was called Tarzan of the Apes .