Nagra has an even bigger problem on their hands. In order to divert pirates from their system to, say, Directv, building a more secure system than their competitor simply isn't enough anymore.
For a pirate to crack Directv, they'd have to pretty much start from scratch. But for a pirate to crack a new form of Nagra protection, unless the new security system is completely replaced, the pirates only have to start working from the last Nagra crack they've developed.
Not only must Nagra develop a new security system that's better than Directv, they have to develop one whose complexity is greater than Directv's entire security system, but which starts from their current vulnerabilities!
So for argument's sake, if Directv's security is equivalent to a factor of 1.0, and Nagra's security is equivalent to a factor of 0.8, the factor of any new security system Nagra develops must surpass a factor of 1.8 to even begin to divert pirates to cracking the Directv system.
As a result, Nagra has a security system which, in my opinion, is permanently broken. There's no way they can increase the security by a factor equivalent to Directv's entire security system.