EPICS Base is publicly available under an open source license, as described in the license section of this website.
For many years after EPICS was first created the distribution was subject to a legal collaboration agreement administered by Los Alamos National Laboratory, which had to be signed by all laboratories wishing to use it.
Versions of EPICS Base between 3.13.7 and 3.14.4 could be distributed only to approved signatories of the EPICS Base license, in order to meet the requirements of the EAR99 classification which EPICS had been given by the US Department of Commerce some years before.
In February 2004 after much work investigating the EAR99 rules, we were given permission to open EPICS Base to a public download, without any restrictions.
Copyright of most of the EPICS Base software and many of the extensions and device support modules is owned by the Universities of Chicago and California. Versions of EPICS Base before R3.13.7 and R3.14.beta2 contained the Copyright notice below.
Copyright © 1991-2000The University of California
The University of Chicago
Portions of this material resulted from work developed under a U.S. Government contract and are subject to the following license: For a period of five years from March 30, 1993, the Government is granted for itself and others acting on its behalf a paid-up, nonexclusive, irrevocable worldwide license in this computer software to reproduce, prepare derivative works, and perform publicly and display publicly. With the approval of DOE, this period may be renewed for two additional five year periods. Following the expiration of this period or periods, the Government is granted for itself and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in this computer software to reproduce, prepare derivative works, distribute copies to the public, perform publicly and display publicly, and to permit others to do so.
NEITHER THE UNITED STATES GOVERNMENT NOR ANY AGENCY THEREOF, NOR THE UNIVERSITIES OF CALIFORNIA OR CHICAGO, NOR ANY OF THEIR EMPLOYEES OR OFFICERS, MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LEGAL LIABILITY OR RESPONSIBILITY FOR THE ACCURACY, COMPLETENESS, OR USEFULNESS OF ANY INFORMATION, APPARATUS, PRODUCT, OR PROCESS DISCLOSED, OR REPRESENTS THAT ITS USE WOULD NOT INFRINGE PRIVATELY OWNED RIGHTS.