Subscribe to Open

Subscribe to Open (S2O) is an alternative, transformative model that aims to transition subscription journals to open access in a fair and sustainable way without Article Processing Charges (APCs). First introduced by Annual Reviews and later endorsed by cOAlition S, S2O has been embraced by a number of publishers who have come together in the S2O Community of Practice. This innovative model has quickly become an accepted approach for achieving open access and builds on collaborative initiatives such as SCOAP3 and Knowledge Unlatched.

Following the subscription renewal cycle, a journal joining the S2O programme will publish its newly accepted content in open access as soon as all subscription renewals have been received. Articles are published under a CC-BY 4.0 license which allows authors to retain the copyright and others to share and adapt the content.

EDP Sciences journals currently transitioning to open access under the S2O model:

Mathematics Subscribe to Open programme
Six mathematics journals are currently published in open access under the S2O model.
Visit the Maths S2O page for a list of participating journals, sponsors, a transparency report and other information.
Astronomy & Astrophysics
Astronomy & Astrophysics, one of the world’s top astronomy journals, is published under a S2O model since 2022. See the A&A S2O page for more details.
Radioprotection publishes important research on all aspects of radiological protection on behalf of the Société Française de Radioprotection. In 2024 financial backing from SFRP and renewed support from our subscribers in 2024 has enabled us to achieve our target, and Radioprotection transitioned to open access publication on 26th of April 2024. More details.

More information:

News stories

  • “Radioprotection successfully moves to open access in 2024 through S2O“ (red)
  • “Astronomy & Astrophysics to remain in open access under Subscribe to Open in 2024“ (read)
  • “Road to Open: Library and institutional support sustains open access in Mathematics journals through Subscribe to Open in 2024“ (read)
  • “Subscribe to Open 2023 Transparency Report for maths journals provides expanded metrics and analysis, marking the third year of commitment to transparency“ (read)
  • “EDP Sciences decides against Open Access transition under S2O for Radioprotection in 2023 “ (read)
  • “Astronomy & Astrophysics to remain in Open Access under Subscribe to Open model in 2023“ (read)
  • “Library community backs Subscribe to Open Mathematics journals - open access continues in 2023“ (read)
  • “Astronomy & Astrophysics Subscribe to Open 2022 Transparency Report published” (read)
  • “New subscriber benefits announced for 2023 as A&A’s subscribe-to-open program evolves” (read)
  • “Radioprotection adopts the Subscribe-to-Open open access model from 2023” (read)
  • “Astronomy & Astrophysics confirms open access in 2022 through Subscribe-to-Open” (read)
  • “Subscribe-to-Open 2022 Transparency Report for maths journals provides new metrics” (read)
  • “EDP Sciences and SMAI Subscribe-to-Open mathematics programme receives support from the CNRS” (read)
  • “Support from library community for Subscribe-to-Open ensures continued open access for Mathematics titles in 2022” (read)
  • “The EDP Sciences-SMAI Subscribe-to-Open programme: how is it going so far?” (read on the S2O Community of Practice blog)
  • “Open Access Transformation for Astronomy & Astrophysics” (read)
  • “Strong performance from maths portfolio in 2020 Journal Impact Factors from Clarivate” (read)
  • “EDP Sciences and Knowledge Unlatched announce a Subscribe-to-Open collaboration” (read)
  • “Momentum builds for Subscribe-to-Open as mathematics portfolio transitions to open access” (read)
  • “Subscribe-to-Open 2021 Transparency Report published” (read)
  • “SMAI awarded funding from Fonds national pour la science ouverte (FNSO) for Subscribe to Open maths journals published in partnership with EDP Sciences” (read)
  • “Successful Subscribe to Open pilot paves the way for a ground-breaking roll out across the EDP Sciences maths portfolio” (read)
  • “Mathematical Modelling of Natural Phenomena transitions to open access under the Subscribe to Open model” (read)


As an advocate of open science, EDP Sciences supports the principle of transparency. We follow FAIR data guidelines to be “as open as possible and as closed as necessary” to decide which information to include. More information is available to interested libraries on request. We hope that releasing supporting information of this kind will help librarians to evaluate our journals and reach an informed decision to subscribe to journals transitioning to open access under S2O.

  Read the 2023 Transparency Report relating to the mathematics Subscribe to Open programme.

  Read the 2022 Transparency Report relating to the Astronomy & Astrophysics Subscribe to Open programme.

  Read the 2022 Transparency Report relating to the mathematics Subscribe to Open programme.

  Read the 2021 Transparency Report relating to the mathematics Subscribe to Open programme.

Subscribers and supporters

We thank subscribing institutions who, by renewing their subscriptions to the participating journals every year, enable us to publish the journals in open access. Occasionally, we may receive other financial or moral support, which is welcome, but not an alternative to subscriptions.

Additional support for the mathematics Subscribe to Open (S2O) programme.


For further information or to join the programme, please please contact us at: This email address is being protected from spambots. You need JavaScript enabled to view it..