An HTML version of my "What Is Open Access?" preprint is now available. This version includes additional links in the body of the document that make it easier to quickly access related information about OA concepts, documents, or systems. While it makes many footnote links available in the body of the document (as well as new ones), it is not an attempt to replicate all footnote links in it.
This paper presents a more nuanced, contemporary view of open access than my "Key Open Access Concepts" excerpt from the Open Access Bibliography: Liberating Scholarly Literature with E-Prints and Open Access Journals; however, it had to be very compact to meet the publisher’s needs, and it omits some topics discussed in the earlier document.
Those wanting a more in-depth recent treatment might want to try the first half of my "Open Access and Libraries" preprint, which covers much of this material more fully as a preliminary to discussing the relationship between open access and library functions and operations. However, the "What Is Open Access?" paper reflects some changes in my thinking about OA not found in "Open Access and Libraries."
A PDF version of "What Is Open Access?" is also available, which is more suitable for printing and reading offline.
"What Is Open Access?" will appear in: Jacobs, Neil, ed. Open Access: Key Strategic, Technical and Economic Aspects. Oxford: Chandos Publishing, 2006. It is under a Creative Commons Attribution-NonCommercial 2.5 License.