Open-access (OA) literature is digital, online, free of charge, and free of most copyright and licensing restrictions. What makes it possible is the internet and the consent of the author or copyright-holder.
If you support open access to peer-reviewed research articles and their preprints, then read my blog and newsletter. See what's been done and what you can do to help the cause. If you're not sure what open access is, then see my overview.