The Catalogus Translationum et Commentariorum functions under a delayed Open Access model whereby gratis Open Access is provided to all editions before the current one, which is sold through the Pontifical Institute of Mediaeval Studies. Some content from the current edition is provided such as additions to the indices of manuscripts and authors treated in the Catalogus.

The CTC aims to aid and to provide for all typical scholarly activity with its content. Content on this site is provided under a Creative Commons licence: Attribution-NonCommercial-NoDerivatives (BY-NC-ND) 4.0 International. You may download PDFs or other content from this site (such as the indices) and share that content, but you may not use that content for commercial purposes and in sharing it must convey the terms of the licence under which you acquired it.

Some pages on this web site are provided under a Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) licence which allows remixing, reusing, and transforming the content. This is indicated by a change in the Creative Commons icon in the bottom left of the web page.

Most notably this applies to the Index of Manuscripts which is provided under the BY-NC-SA Creative Commons licence to enable scholars who wish to build upon this resource.

Scholars publishing work in the Catalogus agree to release their work under the Creative Commons Attribution-NonCommercial-NoDerivatives licence after its initial release by the Pontifical Institute of Mediaeval Studies. This licence will allow anyone to copy and distribute the article for non-commercial use provided appropriate attribution is given. A detailed description of this licence is provided at: