> http://www.usc.edu/uscnews/newsroom/news_release.php?id=3017 I didn't read more than the above, but one imagines that the trick is in handling compression. With bmp, the following immediately comes to mind: Take a seed, generate a mask and xor it with the bmp pixels. Now the pic is white noise of the right size. Give the seed to your friends and they can recreate the original bmp. But need to handle jpg etc. for the size. If you convert to bmp and do the above, you can't compress it back to something small. OTOH, depending on how you mangle the jpg data, it either won't expand, or it expands with certain patterns the constitute leaks of information.
My guess is that their solution is not perfect. Indeed they say that without the permission you get "a degraded, unrecognizable mess" -- clearly less than pseudo-random. > USENIX proceedings yet though. However, somewhat disturbing though that > software developed via NFS grants on the U.S. taxpayer's dime can be > patented. In this sort of thing, the US govt retains the right to unrestricted use throughout the world, so the tax payers normally get something from the patent. In this case, since the main point is porn, you're right -- the taxpayers get nothing... Mike
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