Paywall
A paywall is a method of restricting access to content via a paid subscription. Beginning in the mid-2010s, newspapers started implementing paywalls on their websites as a way to increase revenue after years of decline in paid print readership and advertising revenue. In academics, research papers are often subject to a paywall and are available via academic libraries that subscribe.
Wall padding
The primary purpose of wall padding is to provide a safe level of absorption for an individual making impact with an established object. Often these objects are walls (hence “wall padding”), but also these pads commonly protect bleachers, stage fronts, I-Beams, goal posts, columns, and fences.