[sczkid]

Here's a good summary of the copyright issue: http://www.washingtonpost.com/blogs/answer-sheet/wp/2013/08/...

[Pxtl]

Interestingly it mentions that King himself was involved in suing people for selling videos of his speech, showing that the final lines of the blog article are wrong - he actually did enjoy the protections that copyright law offered him.

[scrabble]

Did he also sue people who weren't profiting from his speech?

I think those are very different things.