Re: [privacydir] Fwd: I-D ACTION:draft-mayer-do-not-track-00.txt

Stephen Farrell <stephen.farrell@cs.tcd.ie> Tue, 08 March 2011 13:53 UTC

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Date: Tue, 08 Mar 2011 13:54:31 +0000
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Cc: privacydir@ietf.org
Subject: Re: [privacydir] Fwd: I-D ACTION:draft-mayer-do-not-track-00.txt
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On 08/03/11 13:31, Chappelle, Kasey, VF-Group wrote:
> Good question - perhaps someone with more technical expertise than I
> have can help. 

That'd be good.

> But there are lots of reasons why site owners would need
> to track their own visitors. Just off the top of my head, where would we
> put things like state management? Maintaining shopping carts from page
> to page or on subsequent visits, for example, requires you to track a
> visitor to your site across pages and sessions. 

Fair enough. However, I suspect that site owners, (like all of
us really) perhaps didn't pay so much attention to privacy in the
past, so it could well be that some of those 1st party tracking
practices are also privacy-invasive and perhaps not as necessary
as they're assumed to be.

However, I don't know, so that's why I asked.

S.

> 
> -----Original Message-----
> From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie] 
> Sent: 08 March 2011 13:20
> To: Chappelle, Kasey, VF-Group
> Cc: Ted Hardie; Sean Turner; privacydir@ietf.org
> Subject: Re: [privacydir] Fwd: I-D
> ACTION:draft-mayer-do-not-track-00.txt
> 
> 
> 
> On 08/03/11 13:14, Chappelle, Kasey, VF-Group wrote:
>> Think of all the basic web functions you'd be breaking if first-party
> tracking weren't allowed. 
> 
> Just wondering. Do we have a good list of those somewhere?
> 
> S.
> 
>> Also consider the very different privacy implications between a party
> you've actively engaged with knowing what you're doing while you
> interact with them, vs. the third party you have no relationship with.
> There's a very real privacy threat here we need to address, but lumping
> all tracking together may not be the way to do it. Emerging regulatory
> structures around this, even in the most restrictive regimes, have
> acknowledged the difference. 
>>
>> Also, anonymous data linked to an individual should and would still be
> covered. But what about data collection that occurs without any unique
> identifiers at all. The Narayanan papers talk about deanonymization of
> individually identifiable data sets. Let's make sure we understand the
> full privacy implications in either case before we jump to conclusions -
> is frequency-capping actually a privacy-impacting process? I'd say no. 
>>
>> One of the problems of data protection law is that it treats all data
> collection similarly, without acknowledging degrees of harm. Let's not
> fall into the same trap. 
>>
>> -----Original Message-----
>> From: privacydir-bounces@ietf.org [mailto:privacydir-bounces@ietf.org]
> On Behalf Of Ted Hardie
>> Sent: 08 March 2011 04:15
>> To: Sean Turner
>> Cc: privacydir@ietf.org
>> Subject: Re: [privacydir] Fwd: I-D
> ACTION:draft-mayer-do-not-track-00.txt
>>
>> I've read this draft, and I think it warrants discussion.
>>
>> The most basic question for me is whether a single bit of information
>> about user preferences is sufficient in this case.  Having additional
>> bits which describe user preferences around tracking by first parties
>> seems to me necessary.
>>
>> In particular, the document appears to assume that 1st party tracking
>> and 3rd party tracking done on behalf of a 1st party (see Exception 2)
>> are permitted even if DNT is set to "do not track".  That is, DNT is
>> really "No third party tracking" and it expects that there is a simple
>> mechanism by which third parties are distinguished from first parties.
>>  I personally have my doubts.  If I get content used to construct a
>> web page from source X and source Y are both X and Y first parties?
>> The single-pixel image may look like an obvious 3rd party, but the
>> protocol mechanics by which I distinguish that from and embedded RSS
>> feed are not clearly described in the document.  I can infer that I
>> use the public suffix list and the FQDN of either the link or the
>> browser bar, but this really needs to be spelled out.
>>
>> The description of interaction with proxies needs to explain whether
>> the header has any impact on whether the response should be cached
>> and, if so, whether returns from the cache should be limited to
>> requests with the same DNT state.
>>
>> I also find the exception for data which is "not linkable to a
>> specific user or user agent" somewhat hard to work through.  As the
>> two Narayanan papers cited show, anonymized data has been shown to
>> allow later identification.  How can we be certain that advertising
>> frequency capping or sequencing data has no similar issue without
>> specifying their format? Even if this is not intended as a loophole,
>> it seems likely to be exploited as one.
>>
>> I have the haunting feeling that starting from this position is
>> inherently weak.  If we are truly interested in user control here, the
>> opposite tack, a "Know This" header which explicitly states the
>> information the user is willing to reveal seems to give far more real
>> control.  This seems to ask the browser to  set a "Don't be evil" bit
>> on its requests, but to leave the real control over what that means so
>> underspecified that reasonable people could conclude wildly different
>> things.
>>
>> regards,
>>
>> Ted Hardie
>>
>>
>> On Mon, Mar 7, 2011 at 6:33 PM, Sean Turner <turners@ieca.com> wrote:
>>> FYI
>>>
>>> -------- Original Message --------
>>> Subject: I-D ACTION:draft-mayer-do-not-track-00.txt
>>> Date: Mon, 07 Mar 2011 17:45:01 -0800
>>> From: Internet-Drafts@ietf.org
>>> Reply-To: internet-drafts@ietf.org
>>> To: i-d-announce@ietf.org
>>>
>>> A new Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>>
>>>
>>>    Title         : Do Not Track: A Universal Third-Party Web Tracking
> Opt
>>> Out
>>>    Author(s)     : J. Mayer, et al
>>>    Filename      : draft-mayer-do-not-track-00.txt
>>>    Pages         : 6
>>>    Date          : 2011-03-07
>>>
>>> This document defines the syntax and semantics of Do Not Track, an
>>>   HTTP header-based mechanism that enables users to express
> preferences
>>>   about third-party web tracking.  It also provides a standard for
> how
>>>   web services should comply with such user preferences.
>>>
>>>
>>> A URL for this Internet-Draft is:
>>> http://www.ietf.org/internet-drafts/draft-mayer-do-not-track-00.txt
>>>
>>> Internet-Drafts are also available by anonymous FTP at:
>>> ftp://ftp.ietf.org/internet-drafts/
>>>
>>> Below is the data which will enable a MIME compliant mail reader
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>>> Internet-Draft.
>>>
>>>
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