Cards are old technology, they do not have enough processing power or memory to assist in decryption, these days most systems use emulators or cams that do not require cards. Some well supported receivers use modified software or patches. You can buy as many funcards as you like but just about all you will be able to do with them is scrape ice off a windscreen. I suggest you start reading some threads because you are obviously new to this and therefore need to do some background reading. If you want to get really technical then
this site is good for educational purposes