VIDEO : Neil Young Has Copyright Beef With Candidate Donald Trump

According to the Rock and Roll Hall of Famer, Donald Trump started his presidential run with a heist ... of Neil Young's classic rock anthem. It made for a hell of an entrance as Donald and his wife Melania marched up to the podium while Young's "Rockin' In the Free World" blared at Trump Tower. Totally patriotic ... to everyone but Young. Neil's rep tells TMZ that Trump never got permission to use the song for his candidacy announcement, and furthermore -- Neil, a Libertarian and Canadian citizen, is NOT down with Trump's campaign. Sources say he's actually backing Vermont Sen. Bernie Sanders.??