no-OS is, by default, licensed under BSD-3-Clause (below). Individual files may be under other terms, stated by the SPDX tag in each file's header; COPYING, the LICENSES/ directory and doc/sphinx/source/license_rules.rst describe them.

COPYING

no-OS is provided, by default, under the permissive:

	SPDX-License-Identifier: BSD-3-Clause

as found in LICENSES/preferred/BSD-3-Clause (the repository's canonical
copy, with the Analog Devices copyright line, is LICENSE_BSD).

In addition, other licenses apply to specific files and directory trees.
The authoritative license for any file is the one declared in that file's
own header (an SPDX-License-Identifier tag or a license header).

The full text of every license used by Analog Devices' own no-OS code is
collected under LICENSES/, grouped by role:

	LICENSES/preferred/    licenses to use for new code
	LICENSES/permissive/   permissive, allowed, but not the default
	LICENSES/proprietary/  vendor device APIs; non-permissive

Third-party libraries are fetched at configure time into libraries/;
each carries its own LICENSE / COPYING file in its directory.

For how licenses are declared and the repository-local LicenseRef-
identifiers used for proprietary vendor device-API code, see:

	doc/sphinx/source/license_rules.rst

The mere aggregation of these files (putting them side by side in one
source repository) does not create a single master license for all of
them. When you build a project that combines files, it is up to you to
ensure the individual licenses are compatible. Some proprietary ADI
vendor-API trees forbid combination with incompatible code outright, and
you may not distribute a binary that violates the terms of any file it
includes.

Nothing in this file restricts, limits, or supersedes the license terms of
any particular file.

LICENSE_BSD

Copyright 2026(c) Analog Devices, 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 Analog Devices, Inc. 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 ANALOG DEVICES, INC. “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 ANALOG DEVICES, INC. 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.