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I suppose if you're using this technology to route around a privacy infringing government, then this doesn't matter since you'll already be breaking the law, and justifiably so.

Now, radio in general can use a variety of frequencies (as the article states), some regulated, some not, and this technology will work with any of these underlying bands in general. But don't try using it with on HAM bands, please. It is certainly not legal to do so in most countries that have HAM licenses, but also it's not ethical, at least within the jurisdiction of countries like the US and Canada. HAM operators pride themselves on operating in the clear, according to string self regulation.

Feel free to use it on unlicensed bands though!