IN THE EXACT SAME WAY THAT YOU CAN CHOOSE TO TIP A STREET PERFORMER IF YOU LIKE THEIR MUSIC (EVEN IF IT'S NOT "ORIGINAL").
HOWEVER, SCOOPING MONEY OUT OF SOMEONE'S TIP JAR AND REDISTRIBUTING THE TIPS (OFTEN WITH A HEALTHY PORTION TO YOURSELF) IS ANOTHER MATTER.
RE: You cannot take away from the author that which does not belong to the author.