Half the Sins of Mankind points to the statement of copyright that Woody Guthrie wrote for his “This Land is Your Land”:
This song is Copyrighted in U.S., under Seal of Copyright # 154085, for a period of 28 years, and anybody caught singin it without our permission, will be mighty good friends of ourn, cause we don’t give a dern. Publish it. Write it. Sing it. Swing to it. Yodel it. We wrote it, that’s all we wanted to do.
Right on, Woody.