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.

Notice Woody Guthrie wrote in at least one of his songbooks. I found it in the comments to a This Land Is Your Land tab, the song the saddly now late great Pete Seeger popularized further, for example singing it at President Obama’s inauguration,