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How could there not be prior art for this? I know that patents are more specific than the title of the patent, but if the patent isn't general enough to cover prior cases of blocking common passwords, then the patent doesn't even protect anything for the patent's authors. If it is general, then it is surely an invalid patent, even by US patent office standards. Very confusing.

Sure - so prove that in a court of law.

That's the problem. The patent system puts all the risk on inventors, none on IP holders.

"Programming perl", Wall & Schwartz, (C) 1990, p. 282ff. contains "infringing" code (AKA prior art).

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