[morisy]

An "obfuscation" wall, if you will.

The rule is, if you come from Google, the answer is hidden at the bottom of the page, behind a bunch of things that say you need to sign in. But if you don't come from Google, the answer is hidden unless you're a member, so you can't e-mail the URL with an answer around to pals, for example. It's a similar policy that the WSJ has for articles, built to keep the Google benefit while encouraging subscriptions.

[mjhnghfh]

They used to have a better paywall where Google's spider could see the results to index but if you went there - even from Google's cache you couldn't.

I suspect Google cracked down on this so they had to unblock the results. The block is in place for a few scientific journals, they must have worked out some deal with google to protect their content.