I don't think this is the same thing at all. If someone slides an envelope under my door that says "Please do not open" am I obliged to leave it sealed? What if I open it anyway and the contents advise me to destroy the message, am I obliged to do this?
What if you go to a friend's house (youtube) and see a letter that says do not read. But you whip out your camera phone, take a picture, come home and read?
The discussion is not about what is possible or should be done, it is about what is legal/moral.