This week, a judge in Pennsylvania moved forward with a lawsuit against the members of Led Zeppelin and their music publishers. The band is accused of plagiarism. Dario Cantatore/AP hide caption

itoggle caption Dario Cantatore/AP

Jimmy Page, Robert Plant, and John Bonham of Led Zeppelin, in 1970. A new lawsuit says the group borrowed from another band's work without crediting it, for the huge hit "Stairway to Heaven." Roger Jackson/Getty Images hide caption

itoggle caption Roger Jackson/Getty Images

Sen. Rand Paul, R-Ky., is sorry for the plagiarized material in his speeches and op-eds. And he thinks some journalists are just plain sorry. Jose Luis Magana/AP hide caption

itoggle caption Jose Luis Magana/AP