Project MUSE, a non-profit collaboration between libraries and publishers, is an online database of peer-reviewed academic journals and electronic books. Project MUSE contains digital humanities and social science content from over 250 university presses and scholarly societies around the world. It is an aggregator of digital versions of academic journals, all of which are free of digital rights management (DRM). It operates as a third-party acquisition service like EBSCO, JSTOR, OverDrive, and ProQuest.