Walter writes a song celebrating president obama. walter then applies for and receives a copyright to the song. if stephen uses the song at concerts, on his tv show, and puts walter's song on a cd, has stephen violated walter's copyright?
a. yes, unless stephen changed the words enough that it has become a parody.
b. yes, if stephen makes any money while using walter's song.
c. no, if stephen used walter's exact song without modification.
d. no, because the song is about the president.