All articles published by MSP become open access after five years past publication (meaning on the fifth January 1st after the publication date). The Annals of Mathematics, while not published by MSP, also becomes open access after five years. Finally, MEMOCS and JSAG are diamond open access publications (free to read, free to publish).
MSP is a no-embargo green open access publisher. We accept submissions of work that is available on open archives in preprint form. We allow authors to deposit the last version of their manuscript after peer review to the ArXiv or other preprint servers. However, we do ask authors that upon publication they add a DOI link to the preprint archive’s version, directing prospective readers to the published article on the journal’s web site. The refereed, copyedited and published version of the article is, after all, the final “version of record.”
Many institutions now require or encourage their researchers to deposit published articles in their institutional repositories. MSP cooperates with this requirement by sending authors or librarians, upon demand, a version of the published file suitable for the purpose. We request that you use the final published version and not a preprint or postprint version, which are not considered definitive.