How? I was under the impression that military-only signal was encrypted. And if someone breaks that encrpytion, blame should go to the poor handling of encryption rather than the person breaking it? Analogy : if you leave a classified document on the train and a passenger reads it, whose fault is it?
They took down the demo code they were informed that they were violating ITAR regulations.
https://www.reddit.com/r/RTLSDR/comments/yu9rei/krakenrf_pul...
That's where the "restrictions have largely been lifted" part comes in.
You can decrypt most of them, but it is illegal to export without a license.
I'm not sure even what section of US code to check but it is certainly plausible that you can (for example) find a surplus device that decodes the signals on EBay and it's actually illegal to do it. You can find radios on EBay that broadcast on bands that are unlawful to use (or unlawful without certain licenses, &c).