Google's Recapta has been reverse engineered also:

http://www.theregister.co.uk/2009/12/14/google_recaptcha_busted/

On 12/15/09, GK <gm5729@gmail.com> wrote:
> http://ask-leo.com/why_do_pictures_in_email_sometimes_show_up_inline_and_sometimes_as_attachments.html
>
> Theres a quick link... HTML AND RTF can be done inline.
>
> As far as one of Lisa's Click jacking thing. I use Iron for all
> unencrypted connections and Firefox for all encrypted. I NEVER click on
> links. I will copy them and paste them if they are http to the other
> browswer or go to Scroogle and paste them in and find their address for
> myself.
>
>
> VampirPenguin
>
> --
> GNUPG validated with key 0xD537A8E1. Questionable
> validations please verify by phone for authenticity.
> RTF, TXT, LaTeX, PDF and DJVU files inline or by
> attachment are gladly accepted. Confidentiality
> guaranteed only by strong encrypted formats.
> Windows GNUPG Version:
> ftp://ftp.gnupg.org/gcrypt/binary/gnupg-w32cli-1.4.10b.exe
> Bcrypt encryption, all platforms:
> http://bcrypt.sourceforge.net/
>
> Proudly made by your nearest Mutt and Vim using Linux.
>


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