I find this overextension of copyright laws maddeningly frustrating. My previous comment (unfortunately) still stands:
Also still under copyright:
"I Have a Dream" until 2038[1]. This is particularly frustrating because the copyright holders include the estate of the person who delivered the speech, but not the estate of the two other people who wrote it (and likely most of it) - not to mention the fact that, by any web-era definition, it was a public performance and also a 'general publication'.
"Happy Birthday" (certainly in the EU until 2016, and potentially in the US too until 2030, though this is disputed[2]).
There is also one movie - whose name escapes me now - which entered the public domain and was then put back under copyright protection subsequently.
In the case of "I Have a Dream", think of the societal cost of raising two generations of students without a complete copy of the speech in their textbooks (as is generally the case).
Alternatively, think of how a 2012 version of "I Have a Dream" would happen today. If hundreds of cell phone recordings of the speech were distributed halfway around the world within mere minutes after the speech, of what relevance would copyright protection be?
[1]http://en.wikipedia.org/wiki/I_Have_a_Dream#Copyright_disput....