Journalism Online won't be a paywall, per se, but a meter that permits access to 10 to 15 articles before any subscription fee would be involved.
In that way, only about 10-15 per cent of users will find access restricted --- others don't use such wide access --- and also permit all online content to be searchable and indexed.
The principle also feeds Brill's view that about 10 per cent of users are prepared to pay for access to particular sites out of loyalty to the brand.