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Posted by Robert Mabee on September 21, 2006, 7:03 pm
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not_here.5.species8350@xoxy.net wrote:
> I have noiticed when using trhe web that sometimes a series of boxes
> appear with numbers in them.
>
> I am asked to type these numbers into boxes as an authentication.
>
> How does this work??
That interaction "proves" that a human is reading the page rather than
a computer program such as a spider indexing the contents, because the
number you see is sent as a picture which the program can not interpret,
or could only interpret with high effort and significant error.
I might use this method to keep an advertiser-supported service from
being pirated by another site that would access my service from a
program and surround my results into their advertising.
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