Google is making changes to its “first click free” system:
In 2009, we updated the FCF policy to allow a limit of five articles per day, in order to protect publishers who felt some users were abusing the spirit of this policy. Recently we have heard from publishers about the need to revisit these policies to reflect the mobile, multiple device world. Today we are announcing a change to the FCF limit to allow a limit of three articles a day.
For those not away, FCF allows paywalled or reg-walled sites to allow visitors from Google to read an article they find via search without having a subscription or login.