What is the CWTS method for Open Access identification? According to the note, this is a combination of 5 different sources (DOAJ, PMC, ROAD, CrossRef, and OpenAIRE). As mentioned above, these data can be obtained from a single services, such as Web of Science and Unpaywall. AGain, it is unclear why Clarivate's services has been replaced with the more complex Elsevier one. Will these data, matching algorithms, and other methods be made available?