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Nat,<div><br></div><div>I agree, and I'm glad you highlighted this. Privacy also pertains strongly to other attributes. I think consistent use of AX as a transport protocol makes it much easier for sites to give proper privacy options to users.</div><div><br></div><div>Separately, persistent opaque identifiers are a really good thing, especially when unique to a particular RP/SP. When Yahoo first made the decision to use them as the default in their implementation, I was worried that most of their applications, users, and developers would be baffled, and didn't know why they weren't targeted. I wonder if Allen has any new words of wisdom to share now that he has experience with them in practice.</div><div><br></div><div>Take care,</div><div>Nate.</div><div><div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div>Now, IMHO, privacy advocates have much to say on this: correlations. </div><div>So, we should tread carefully in this area, though. </div></span></blockquote></div><br></div></body></html>