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.
Sirius was portrayed by Gary Oldman in the film adaptations of Prisoner of Azkaban, Goblet of Fire, Order of the Phoenix, and Deathly Hallows â Part 2. Sirius as a teenager made a brief appearance in Order of the Phoenix (played by James Walters).