[Groxx]

As far as I can tell, it's just a reasonably large on-demand (until it overheats) source of randomness. All the other OTP principles hold, the glass-generated random bits are the only new things. And you can still "electronically copy" it - viruses are great at executing code, such as dumping all the random data such a thing can generate (they even say it would only take 24 hours, and less to upload).

I suspect it's not even very good randomness. Long dark / bright lines from deeper scratches at either end, skewed randomness due to the atomic structure of glass (though glass is probably a reasonably good natural source, since it's not crystalline), that sort of thing happens when you're dealing with physical (hard, static) structures. And this thing has to be very reproducible or you can't decrypt your message, so we're not talking extracting randomness from a warm cup of tea.