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We have different fees for different kinds of community participation. These include annual membership fees and content registration fees for members, optional member fees for Similarity Check, and annual subscription fees for Metadata Plus. Our Membership and Fees Committee regularly reviews our fees and makes recommendations to our Board. In July 2019 our board voted to approve our fee principles. We haven’t increased the regular annual membership or content registration fees since 2004 years but please note that fees may be changed soon as part of the Resourcing Crossref for Future Sustainability (RCFS) Program that started in 2024.