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Identifying and monitoring Open Access (OA) publications might seem a trivialtask while practical efforts prove otherwise. Contradictory information ariseoften depending on metadata employed. We strive to assign OA status topublications in Web of Science (WOS) and Scopus while complementing it withdifferent sources of OA information to resolve contradicting cases. We linkedpublications from WOS and Scopus via DOIs and ISSNs to Unpaywall, Crossref,DOAJ and ROAD. Only about 50% of articles and reviews from WOS and Scopus couldbe matched via a DOI to Unpaywall. Matching with Crossref brought 56 distinctlicences, which define in many cases the legally binding access status ofpublications. But only 44% of publications hold only a single licence onCrossref, while more than 50% have no licence information submitted toCrossref. Contrasting OA information from Crossref licences with Unpaywall wefound contradictory cases overall amounting to more than 25%, which might bepartially explained by (ex-)including green OA. A further manual check foundabout 17% of OA publications that are not accessible and 15% non-OApublications that are accessible through publishers' websites. Thesepreliminary results suggest that identification of OA state of publicationsdenotes a difficult and currently unfulfilled task.

Merits and Limits: Applying open data to monitor open access publications in bibliometric databases