I just googled a little bit:
Citation from that last URL:
For small companies, Microsoft proposes computer- and human-solvable
puzzles that can be used to distinguish legitimate senders from
spammers. If a computer user receives an e-mail from a sender not on
a safe list, the recipient's PC would send out a puzzle that the
sender or the sender's computer would have to solve. For someone
sending just a few messages, the puzzles could be solved
quickly. For a spammer sending thousands or millions of messages,
the burden would be a disincentive.
Two years ago Microsoft made exactly the same proposal (computer-
_and_ human-solvable puzzles) and widely announced that the problem
with spam would be gone within two years.
Now, two years later, we all know that they failed. And a university
is now coming up with repeating the very same proposal? Strange...
BTW: Isn't it time to remind Microsoft to their 2003's promise to have
solved the Spam problem within two years?
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