Something else to consider, which I don't think I saw in your page, was the 1978 rule. After 1978, works are automatically copyrighted and last for x amount of years after the death of a person.
Copyrighted material before 1978 is not protected unless the owner applies for protection.
I would like to see the number law suits pursued as to using a picture on a web site that doesn't profit anything or is benefited financially because of the picture posting. For instance, Wikitree does not benefit or gain financially because a picture of a movie star is posted in a profile.
Logo copyrights, I think are a little different. To keep the copyright protection of a logo, the company has to legally pursue violations. So, there is a third party site that produces WikiTree shirts or mugs with a Coca Cola Swish and uses the same Coca Cola font. That is up to the company's legal team to decide if it is worth pursing.
Also, I would like to see what happens if one actually gets into trouble. Many times, a lawyer will just send a letter and ask that the copyrighted material be removed by a certain date, and if not, further action would be taken. (more of a threat than anything else)
Most of the time, the law suit is about money. If the lawyer sees a lot of time spent for almost no financial gain for himself, he may tell his client to "forget it". That's what happened to me. We didn't get paid for a sign we made, delivered out of state, and it was installed on private property. We could not get paid, and could not go on the property to remove the sign. The lawyer sent a letter, which was ignored, and then told us to "forget it" because it would cost more than we could afford to pay his legal fees.
When George Harrison was sued for the "My Sweet Lord" knock off of "He's So Fine" there was millions of dollars at stake.
What are the real chances a lawyer sends a letter and tells the offender to stop, verses a real law suit?