WPA is WiFi Protected Access - it's the most common method of encryption used to secure a wireless network. If you have a laptop or smartphone and you're trying to connect to a WiFi network, you'll usually need to enter a WPA key (or password) in order to connect to it.
In the live-action adaptations by Sir Peter Jackson, Sauron is portrayed by Benedict Cumberbatch in The Hobbit trilogy (who also portrays Smaug in the same trilogy) and was played by Sala Baker and voiced by Alan Howard in The Lord of the Rings trilogy.
The actress who played Nymphadora Tonks in the Harry Potter movies, Natalia Tena, plays Osha in Game of Thrones. She is the wildling woman that sticks with Bran, Meera, Jojen, Hodor and Rickon in their journey beyond the Wall, and later separates with Rickon.