Find out more about open science

What is open science?

Open access to knowledge is a worldwide movement initiated by the Budapest Declaration in 2002. The objective is immediate, free and open access for all to the results of scientific research in all its forms (publications, research data). By putting your work online immediately, open access increases your visibility and thus your readership, while respecting intellectual property rights and the conservation of your works.

There are two possible ways of disseminating scientific production using open access:

green laneThe Green Way
(or Green Open Access):

The green route involves researchers depositing their publications in an "open archive" such as HAL, a repository where publications from scientific research and teaching are deposited with free and open access. This is known as self-archiving.
golden wayThe golden way
(or Gold Open Access):


Open access publication in a publisher's journal.
3 possibilities:
- Free open access journal without APC (platinum or diamond route)
- Paid open access journal (author-pays)
- Open access publication in a "hybrid" subscription journal

Published September 21, 2021
Updated March 22, 2022