nope, it's one of those laws that the police can use on anyone they don't like, anytime. There was a good article of how this "criminalise everyone, and then only prosecute the ones you don't like" attitude was essentially how the US operates by default nowadays - It was on HN a few months ago but I can't find it now.
apologies if I wasn't clear; there are plenty of laws "still on the statute book" which everyone breaks but which would never be prosecuted. e.g. copying music from CD to iPod before about 2010, or compulsory archery practise with the parish vicar on the village green on Sundays.
I was drawing the distinction between that type, which are simply archaic, and this type, which have been designed to incriminate everyone.
there was a chap who had this law used against him a few years back, I don't remember what happened though but it was a big deal at the time.
It was to do with encrypting random data for physics or a game or something and the government got hold of it but because the data was encrypted one way he couldn't give them a key and he was going to go to prison for two years.
I've heard nothing about it since though with all this PRISM stuff and people encrypting their emails I'm surprised it hasn't resurfaced sooner.