http://www.straightdope.com/columns/read/2345/are-blue-jays-not-really-blue-plus
Yeah, I just wanted to point out, Cecil Adams skipped one important point. Part of the reason why you could sing this song (before it became public domain), was the fair use doctrine.
Here is the Wikipedia cite. But basically, the fair use doctrine says that even consumers of copyrighted material, have certain rights.
I first read about the fair use doctrine in my law dictionary (which, FWIW, is now about 20 years old, and hopefully not out-of-date). According to my law dictionary, the fair use doctrine used to be a matter for the courts. Now, it is largely a statutory matter, though the courts may still have some say.
So, for example, if you want to save a copyrighted picture on your computer, but you’re the only one who will ever see it, that is okay. But if you start selling it or (this is important) “distributing” it (N.B.), that may be a different matter.
One test of the fair use doctrine came up recently with file sharing on the internet. People would say, but I am only sharing this MP3 with a few of my friends on line. But the recording industry said, BS, you are distributing it without permission, “that” is illegal.
Plus as my teacher once told us in grade school, it is not like the people who owned the song “Happy Birthday” are going to come to your house and arrest you at your birthday party. So their were de facto applications as well, even before the fair use doctrine.
:):)
P.S. I just read the other thread. And apparently the copyright on “Happy Birthday” won’t expire until 2030. But everything else I said still applies;).