I didn't realize that "Selma" wasn't "official". I thought it actually had the blessing of the King family. Apparently not. I think the screenwriter did an excellent job of evoking MLK without using his actual words. Impressive. Because in watching the movie, it felt like they were actual speeches made by him.

http://www.hollywoodreporter.com/news/oscars-how-selma-filmmakers-made-755242

EXCERPT:

"Because King's speeches were licensed to another project, Selma's filmmakers had to find a way to re-create the meaning of MLK's words without tres­passing on his actual, historic language. That means they had to rewrite MLK, though sometimes this meant just altering a verb or two. During the scene at the funeral of civil rights demonstrator Jimmie Lee Jackson, for instance, the MLK in the film gives a rousing oratory, asking the crowd, "Who murdered Jimmie Lee Jackson?" In real life, King asked, "Who killed him?" In another scene, King rallies protestors with the words, "Give us the vote," while in reality King said, "Give us the ballot." The film skirts close to the words without using them."