Intellectual property violates the libertarian principles of homesteading and exchange, and it makes no sense as a right at all without the assumption of an omniscient and omnipotent organization willing to enforce it. Unlike homesteading and exchange, intellectual property is not something that anyone can reasonably expect to be able to defend and control.
In order to help users find and access content that may require registration or a subscription, Google offers an option to web and news publishers called "First Click Free." The user's first click to your content is free and does not require logging in. Then you may block the user with a login or payment or registration request when he tries to click away from that page to another.
Given a water distribution network, where should we place sensors to quickly detect contaminants? Or, which blogs should we read to avoid missing important stories? Outbreak detection can be modeled as selecting nodes in a network.