Where's the evidence for restricting access?

EDITOR—Proponents of access controls for the electronic version of the BMJ based this policy on several grounds: that it was required for economic reasons (affordability); it would produce revenue (profitability); and it would not have serious adverse consequences for doctors or patients (harmlessness).

Each of these statements is contentious. Now that restrictive practices have been put in place, they can be and should be subjected to a fair test. This is worth doing because the data …