UCSF Chimera is licensed for noncommercial use at no cost by the Regents of the University of California. You must agree to the terms and conditions of use as specified in the license agreement before you will be permitted to download Chimera (preview the agreement).

Chimera extension developers please note: The purpose of the Ownership and Assignment of Copyright section of the license agreement is to protect UCSF's copyright in the existing code and derived works based on our code. It does not cover original code developed by others. Extensions to Chimera that are not modifications, improvements, or derivatives of UCSF copyrighted code (programming examples we provide are explicitly not copyrighted) are considered the property of their authors.

Commercial use of Chimera is covered by a separate, written license agreement. Commercial licensing costs are tier-based, depending on the number of users. Please contact us if you are interested in using Chimera for commercial purposes.

Chimera software and documentation is copyrighted by the Regents of the University of California. All rights reserved. Chimera is provided pursuant to a license agreement containing restrictions on its disclosure, duplication and use.