From owner-freebsd-questions@FreeBSD.ORG  Sat Feb 25 04:32:39 2012
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Date: Sat, 25 Feb 2012 14:27:44 +1000
From: Da Rock <freebsd-questions@herveybayaustralia.com.au>
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Subject: Re: Security? [Re: Why is this Symbol in the front of your website.
 A humble request.]
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On 02/25/12 12:03, David Brodbeck wrote:
> On Fri, Feb 24, 2012 at 5:15 AM, Dave<dave@g8kbv.demon.co.uk>  wrote:
>> Those address links need changing to graphic's, so that most address
>> harvesting bots won't get anything usable.
>>
>> Mk1 eyeball can still see what's what, but if you have to use the info,
>> you have to re-type it manually.
> I really don't recommend that.  Keep in mind not everyone can use the
> "Mk1 eyeball."  Websites need to be accessible to blind people using
> screen reader software, too.
And therein lies the problem. How do you maintain accessibility while 
preventing bots from harvesting? You can't have your cake and eat it 
too... :)

Only solution lies in a security gate of good filters and blocklists. 
But occasionally one or two will still pass.