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FPS members must allow technical verification #65

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@dmarti dmarti commented Sep 7, 2021

A site that claims first-party set membership must allow automated
validation so that user agents and independent enforcement entities
can check that it is in compliance with UA Policy.

Independent enforcement entities that detect that one member of an
FPS is handling user data in a manner inconsistent with the FPS shared
privacy policy should be able to presume that the FPS is invalid without
waiting to find out if other members of the FPS are violating the policy
in the same way.

Refs: #43

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hober commented Sep 7, 2021

The IPR check fails, @dmarti, because you're not a member of the Privacy CG. If you join the CG we can have the IPR bot run again.

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dmarti commented Sep 7, 2021

@hober Thank you, I checked and was listed under "former members" on the CG page, just re-joined. (my previous PR #56 had the IPR check succeed)

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dmarti commented Oct 12, 2021

Some kinds of domain data that could be verified by an IEE: #43 (comment)

(for example, an IEE might require that FPS members acknowledge mail sent to a whois admin contact.)

Make it clear that a site cannot claim first-party set membership
and then use ToS or configuration to disallow automated checks by a
user agent or independent enforcement entity.

An independent enforcement entity may be able to detect that an FPS
member domain is handling user data in a manner inconsistent with the
shared privacy policy. An FPS in which this occurs may be presumed
invalid without waiting to check if other members of the FPS violate
their posted policy in the same way.

(Many downstream violations of privacy policy, such as email spam and
telemarketing, are randomized, or data sets are partitioned. An
independent enforcement entity may detect a privacy policy violation
by one member of a set but not others that are doing the same thing,
and would need to be able to disallow the FPS.)

Refs: WICG#43
@dmarti dmarti added the ua_policy Issues related to UA Policy label Jan 19, 2022
@@ -80,6 +82,8 @@ For each element of the First Party Set policy, we propose an enforcement method

<sup>3</sup> Site authors must ensure that a hyperlink to the common group privacy policy is placed on the default page of each domain listed on their proposed set; such that an automated technical check can be used to verify its presence.

<sup>4</sup>When an independent enforcement entity discovers that one member of a First-Party Set is using user data in a manner inconsistent with the common Privacy Policy, it may consider the set as invalid, without waiting for further verification steps to discover whether or not other members of the set are also violating their own policy in the same way.
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Would building in a notice period before marking a set invalid be appropriate, considering that losing FPS membership may have site compatibility implications?

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It seems like a notice period would increase the resources required for the IEE. If a set can violate its own policy, then step back with little or penalty if it gets caught, then many marginal sets will try various violations to see what they can get past the IEE, and make the IEE have to check for more kinds of violations, more often.

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@dmarti, do you have thoughts on how the independent enforcement entity can discover if a member of the FPS is using user data that is inconsistent with the common Privacy Policy. I don't believe it is reasonable for IEEE to audit whether data usage aligns with privacy policy or not.

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@HarneetSidhana The section on Responsibilities of the Independent Enforcement Entity includes Conducts manual reviews/investigations of First Party Sets that have been flagged by civil society/research community.

Either the terms of service for each site in the set would need to allow the IEE sufficient access to carry out these reviews/investigations, or the controller for the set would need to separately grant the IEE permission to access the site as needed for a review/investigation.

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