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.
Elsa is played by Georgina Haig, Anna by Elizabeth Lail, and Anna's love interest Kristoff by Scott Michelle Foster. Georgina wore Elsa's iconic blue gown to the 'Once Upon a Time' panel at the Comic-Con event. The story of 'Frozen' was brought to the series in the Season 3 finale of the show.