diff --git a/sys/sys/_clock_id.h b/sys/sys/_clock_id.h
index a88eb063122f..47a551428dc3 100644
--- a/sys/sys/_clock_id.h
+++ b/sys/sys/_clock_id.h
@@ -1,104 +1,93 @@
 /*-
- * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-License-Identifier: BSD-2-Clause
  *
- * Copyright (c) 1989, 1993
- *	The Regents of the University of California.  All rights reserved.
- * (c) UNIX System Laboratories, Inc.
- * All or some portions of this file are derived from material licensed
- * to the University of California by American Telephone and Telegraph
- * Co. or Unix System Laboratories, Inc. and are reproduced herein with
- * the permission of UNIX System Laboratories, Inc.
+ * Copyright (c) 2021 Netflix, Inc.
  *
  * 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. 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.
- *
- *	@(#)time.h	8.3 (Berkeley) 1/21/94
  */
 
 #ifndef _SYS_SYS__CLOCK_ID_H
 #define	_SYS_SYS__CLOCK_ID_H
 
 /*
  * These macros are shared between time.h and sys/time.h.
  */
 
 /*
  * Note: The values shown below as a comment for the __POSIX_VISIBLE values are
  * the ones FreeBSD traditionally used based on our reading of the POSIX
  * standards. However, glibc uses 199309 for all of them, even those many were
  * not defined there. To remain bug compatible with glibc means more software
  * that relied on the glibc behavior will compile easily on FreeBSD.
  *
  * Also, CLOCK_UPTIME_FAST is improperly visible temporarily for the lang/pocl
  * port until it can be updated properly. It incorrectly assumes that this was a
  * standard value. It will be moved back to the __BSD_VISIBLE section once the
  * issue is corrected.
  */
 
 #if __POSIX_VISIBLE >= 199309		/* 199506 */
 #define CLOCK_REALTIME		0
 #endif /* __POSIX_VISIBLE >= 199309 */
 #ifdef __BSD_VISIBLE
 #define CLOCK_VIRTUAL		1
 #define CLOCK_PROF		2
 #endif /* __BSD_VISIBLE */
 #if __POSIX_VISIBLE >= 199309		/* 200112 */
 #define CLOCK_MONOTONIC		4
 #define CLOCK_UPTIME_FAST	8
 #endif /* __POSIX_VISIBLE >= 199309 */
 #ifdef __BSD_VISIBLE
 /*
  * FreeBSD-specific clocks.
  */
 #define CLOCK_UPTIME		5
 #define CLOCK_UPTIME_PRECISE	7
 #define CLOCK_REALTIME_PRECISE	9
 #define CLOCK_REALTIME_FAST	10
 #define CLOCK_MONOTONIC_PRECISE	11
 #define CLOCK_MONOTONIC_FAST	12
 #define CLOCK_SECOND		13
 #endif /* __BSD_VISIBLE */
 
 #if __POSIX_VISIBLE >= 199309		/* 200112 */
 #define CLOCK_THREAD_CPUTIME_ID	14
 #define	CLOCK_PROCESS_CPUTIME_ID 15
 #endif /* __POSIX_VISIBLE >= 199309 */
 
 /*
  * Linux compatible names.
  */
 #if __BSD_VISIBLE
 #define	CLOCK_BOOTTIME		CLOCK_UPTIME
 #define	CLOCK_REALTIME_COARSE	CLOCK_REALTIME_FAST
 #define	CLOCK_MONOTONIC_COARSE	CLOCK_MONOTONIC_FAST
 #endif
 
 #if __BSD_VISIBLE
 #define TIMER_RELTIME	0x0	/* relative timer */
 #endif
 #if __POSIX_VISIBLE >= 199309
 #define TIMER_ABSTIME	0x1	/* absolute timer */
 #endif /* __POSIX_VISIBLE >= 199309 */
 
 #endif /* _SYS_SYS__CLOCK_ID_H */