Science Express is Science Magazine’s pre-publication venue, where articles accepted for publication are made available prior to the online publication of the complete issue. While almost all other society and commercial publishers provide this service at no additional cost, AAAS does not. UC libraries have decided not to pay the extra charge for Science Express for various cost and licensing issues. See CDL's Challenges to Licensing from Some Publisher for more information. At the present time, if individuals need access to the SE content, they will have to use their existing AAAS memberships or become AAAS members.