It can be inferred from the passage that it is legal if A.  two songs, written by two different composers, have the same melody B.  two books, written by two different authors, have the sam

two songs, written by two different composers, have the same melody

two books, written by two different authors, have the same titles

two drawings, created by two different artists, have the same images

two plays, created by two different playwrights, have the same plot and characters