Could someone give me some info about Received Pronunciation, please!

What does it mean? It is a term used only for people who speak a native language?

What is Mid-Atlantic English? Is a kind of refined american accent? like the accent from PhD's in Harvard? I'm confused! Can you give me an example of someone who speak this accent? Thank ever so much!!!

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Comments  (Page 4) 
John Hillerman in the film "What's Up Doc" as the hotel manager used mid- atlantic, As Higgins in "Magnum" he used receive pronuncitation.
Orson Welles as Lamont Cranston in his radio performance on the "Shadow" series used mid atlantic, one of the most beautiful I have heard.

Jim Backus as Thurston Howell III lampooned mid-atlantic in Gilligan's Island"
Franklin Roosevelt had a very thick mid atlantic.
Walter Chronkite used mid western standard.
Seth MacFarland has the best AND funniest received pronunciation from a non native as Stewie in "Family Guy.
I'm sorry, "LanguageLover", but you mis-read that article. Humphrey Bogart, Henry Fonda and John Wayne are listed as actors who specifically DIDN'T talk with a "Mid-Atlantic English". Before those actors became popular, the Mid-Atlantic dialect was much more common in movies.
Students: Are you brave enough to let our tutors analyse your pronunciation?

How could he say taken out and hanged it hardly finishes that rhyming sentence and besides Harrison did not write the script . Then he himself took voice lessons while in the RAF