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Re: how does host B know that its visitor is the one that visited host A?

From: Mukul Gandhi <gandhi.mukul@gmail.com>
Date: Wed, 17 Aug 2011 19:10:34 +0530
Message-ID: <CABuuzNMJm4LB26oa93b1+i3R==fsVfbeMq7vkU9nE72_n+Gt_Q@mail.gmail.com>
To: Jonathan Rees <jar@creativecommons.org>
Cc: www-tag@w3.org
On Tue, Aug 16, 2011 at 1:00 AM, Jonathan Rees <jar@creativecommons.org> wrote:
> It's possible that this is being used, but (a) Alan showed that there
> is no need to check the User-agent header; what I saw can be done with
> classical cookies and transclusion, (b) User-agent won't let the
> advertisers tell browser instances apart, since you could have
> multiple computers sending the same User-agent string on different
> computers, all with the same IP address (thanks to NAT). If an
> advertising service only checked User-agent it would have both
> imprecise targeting (decreasing the value of the service) and a much
> more serious privacy situation.

Thanks for the explanation. Sorry, that I missed you were talking
about browser instances and not browser vendors (that's what I thought
initially, while I wrote my previous mail).

Mukul Gandhi
Received on Wednesday, 17 August 2011 13:41:21 UTC

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