Some CAPTCHA systems actively prevent
third party software from resolving their CAPTCHA codes. Thus, one of
the
reasons why WebVisum cannot resolve every CAPTCHA. (A famous
multinational private irish airline's booking form has one of the above
mentioned, and it will tell you that it detects software trying to solve
the CAPTCHA, and thereafter it pushes you back to the beginning again.)
----- Original Message -----
From: "Dan Rossi" <d...@andrew.cmu.edu>
To: <jaws-users-list@jaws-users.com>
Sent: Monday, January 28, 2013 3:42 PM
Subject: [JAWS-Users] CAPTCHA issues.
Regardless of the various algorithms for producing CAPTCHAs, I do not
believe that WebVisum cares. It is just doing OCR on the graphic. It
may be optimized to filter out background stuff, but it has nothing to
do with the way that the CAPTCHA is produced. Thus, it would not be
like Research It, where they would have to deal with a million
changing parameters every time someone came out with a new CAPTCHA
system. It is still just OCR.
Having said that, it doesn't really surprise me that FS doesn't want
to get into that business as the legality of automatically solving
CAPTCHA images is sketchy at best. Probably not so much a legality
issue as a violation of terms of service issue.
--
Blue skies.
Dan Rossi
Senior Oracle Database Administrator
Carnegie Mellon University.
E-Mail: d...@andrew.cmu.edu
Tel: (412) 268-9081
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