“…From the perspective of measuring open access there are a variety of copyright licenses and access restrictions. Matsubayashi et al (, p. 6) measure a category of “restricted OA (e.g., user must register to gain [free] access)” but only at 0.4% of all articles; Kurata, Matsubayashi, Mine, Yokoi, and Morioka () find 0.6% restricted in this way. Scholarly Publishing and Academic Resources Coalition (SPARC) () provide a six‐faceted approach to the evaluation of a journal's policies: reader rights, reuse rights, copyrights, author posting rights, automatic posting, and machine readability.…”