Via Slashdot, Washtech.com: From the Shareware Industry, Lessons on Keeping Downloaders Honest, by Rob Pegoraro. Great article. Here's another article I have to read: Bitwise Operator: The Plain Truth About Piracy, also via Slashdot.
The gist of it is that a shareware company was able to reduce piracy by encoding the date of registration in the registration key, and making the software no longer accept it if the key was older than 30 days. Pretty smart.
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