Budapest Open Access Initiative (2002)
A gathering of researchers and librarians in Budapest issued the Budapest Open Access Initiative, defining open access and calling for research literature to be freely available online. The declaration helped spawn both repository-based (green) and journal-based (gold) open access.
Universities, funders, and researchers adopted open access mandates and policies through the 2000s and 2010s.
Two decades later, commercial publishers dominate open access through high article-processing charges; diamond journals remain a small share of the market.
Diamond journals come closest to the original open access vision of free-to-read and free-to-publish. The documented fractures show that vision fragmenting under commercial pressure.
