Robert Frost and his heirs and assigns: THE ROAD NOT TAKEN.

"Is Frost out of copyright?" his nibs asked.

"Could be, I suppose," I answered. "All depends on whether his heirs and assigns renewed during that period when copyrights needed to be renewed."

"Well, look at this. I'll send you a link."

The link was to Creativity, whose links self-destruct soon after they're posted.

Here's another link. Ford and the Road Not Taken.