Basically that means that anyone who happens to have a petawatt laser sitting around could make one of these things. When it gets to the point where we can make them with a 3D printer we got trouble. BTT
A story I read a couple of decades ago in Omni:
100 years in the future, we live in a world with a computer network very similar to what we call the internet. Some guys are mining the astroid belt, which have been determined to be the remains of a blown up planet.
They come across an artificially made device the size of a football. They bring it to the head office and notice it is some sort of electronic device with computing capabilities so they plug it into their computer, effectively plugging it’s contents into the world’s computers. It dumps its data on their computer screen.
It is instructions on how to blow up a planet using simple ingredients and tools found around the house.
The end...