Apple makes their developer libraries freely available online with one important exception: Prerelease libraries can only be accessed by registered developers.
Why would a non-developer want to read these? Well if you’re like me, you might be tech-savvy and curious about iOS 7 or Mavericks but not want to spend $99 to become a registered developer. Luckily there’s an easy solution.
Become a Safari Developer
Simply sign up to become a Safari extensions developer. It’s a free program that carries some of the same benefits as a paid iOS or Mac developer membership.
Simply by providing your address and an Apple ID, you gain the ability to read prerelease developer documents and learn details about Apple software months before it’s released.