Captchas have been getting more and more difficult as bots gets
smarter. Bots are now smarter than people at deciphering those nasty
smeared images, making Captchas obsolete.
There are alternatives. See
In particular see http://areyouahuman.com/
which is a quite painless scheme.
Roedy Green Canadian Mind Products
I would be quite surprised if the NSA (National Security Agency)
did not have a computer program to scan bits of shredded
documents and electronically put them back together like a giant
jigsaw puzzle. This suggests you cannot just shred, you must also burn.
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