It’s not always easy for us researchers to stomach the idea of others making money off of our work, but at PLOS, when we say “open access”, we have always meant more than just making the literature of research readable. When we publish articles under a Creative Commons Attribution (CC-BY) license, we intend that any person (or computer) is free to use the work, to combine it with other information or data, and to create new works out of it, for any legal purpose – including commercial re-use.