OpenDKIM is distributed under the following license terms.

Portions of the software originating from the Sendmail dkim-milter codebase are covered by the Sendmail Open Source License. Code developed under The Trusted Domain Project is covered by a BSD-style license.

The full license text is included in the LICENSE file in the source distribution and in the GitHub repository.

Copyright (c) 2005-2008, Sendmail, Inc. and its suppliers. All rights reserved.

Copyright (c) 2009-2015, The Trusted Domain Project. All rights reserved.