AES is an Advanced Encryption Standard, it was brought out to slow down piracy but failed originally, recently they started changing the keys every 20-30 minutes, or quicker, which makes viewing difficult.
Some receivers have the ability to connect to your computer, and thus the internet, and interact with software to download the new key, unfortunately these sites do get closed down and new sources have to be found.
If you want to try it first you have to get the latest keys, try an AES keyfinder, search on google, and then manually input them into your receiver/cam via the menu, but you only have a few minutes to do all this before they change again so good luck.