> WRT some defences becoming outdated by time, well, it probably would not be two-decades behind, but a couple years or so at most. Even then, ensuring that is better then nothing.
Not necessarily. What if the law mandates use of, say, an encryption algorithm that has been cracked? You can't move to a new one without breaking the law.
Not necessarily. What if the law mandates use of, say, an encryption algorithm that has been cracked? You can't move to a new one without breaking the law.