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Creative Commons increases "the body of work that is available to the public for free and legal sharing, use, repurposing, and remixing." In other words, these are images that you can use for projects, presentations, etc., often with the only restriction being that you list the creator's name.
From Wellcome Library's online image collection. From MS 49, Apocalypse, (The), [etc.]. Apocalypsis S. Johannis cum glossis et Vita S. Johannis; Ars Moriendi, etc.; Anatomical, medical, texts, theological moral and allegorical 'exempla' and extracts, a few in verse. Folio 38 recto