This speech has been through years of court cases to determine, in various jurisdictions, whether it was ever copyrighted, and the United States court system recently laid down their rulings that this speech had never been copyrighted, since at that time it was required to post a copyright notice on printed copies to be distributed, and this speech was distributed without such an extra (C) Copyright notice as was then required in the US. The US revised this law in 1989, an no longer requires such notice.