--- /dev/null
+Valid-License-Identifier: BSD-4-Clause
+SPDX-URL: https://spdx.org/licenses/BSD-4-Clause.html
+Usage-Guide:
+ To use the BSD 4-Clause "Original" or "Old" License put the following
+ SPDX tag/value pair into a comment according to the placement
+ guidelines in the licensing rules documentation:
+ SPDX-License-Identifier: BSD-4-Clause
+License-Text:
+
+Copyright (c) 1993 The Regents of the University of California. All
+rights reserved.
+
+This software was developed by the Computer Systems Engineering group
+at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+contributed to Berkeley.
+
+All advertising materials mentioning features or use of this software
+must display the following acknowledgement: This product includes
+software developed by the University of California, Lawrence Berkeley
+Laboratory.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ 1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+
+ 3. All advertising materials mentioning features or use of this
+ software must display the following acknowledgement: This product
+ includes software developed by the University of California,
+ Berkeley and its contributors.
+
+ 4. Neither the name of the University nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.