DPDK

http://dpdk.org/

Intel DPDK version 18.11.1

Copyright (c) 2015, Intel Corporation

All rights reserved.

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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

The DPDK uses the Open Source BSD-3-Clause license for the core libraries and drivers. The kernel components are naturally GPL-2.0 licensed.

Including big blocks of License headers in all files blows up the source code with mostly redundant information. An additional problem is that even the same licenses are referred to by a number of slightly varying text blocks (full, abbreviated, different indentation, line wrapping and/or white space, with obsolete address information, ...) which makes validation and automatic processing a nightmare.

To make this easier, DPDK uses a single line reference to Unique License Identifiers in source files as defined by the Linux Foundation's SPDX project (https://spdx.org/).

Adding license information in this fashion, rather than adding full license text, can be more efficient for developers; decreases errors; and improves automated detection of licenses. The current set of valid, predefined SPDX identifiers is set forth on the SPDX License List at https://spdx.org/licenses/.

DPDK uses first line of the file to be SPDX tag. In case of *#!* scripts, SPDX tag can be placed in 2nd line of the file.

For example, to label a file as subject to the BSD-3-Clause license, the following text would be used:

SPDX-License-Identifier: BSD-3-Clause

To label a file as GPL-2.0 (e.g., for code that runs in the kernel), the following text would be used:

SPDX-License-Identifier: GPL-2.0

To label a file as dual-licensed with BSD-3-Clause and GPL-2.0 (e.g., for code that is shared between the kernel and userspace), the following text would be used:

SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0)

To label a file as dual-licensed with BSD-3-Clause and LGPL-2.1 (e.g., for code that is shared between the kernel and userspace), the following text would be used:

SPDX-License-Identifier: (BSD-3-Clause OR LGPL-2.1)

Any new file contributions in DPDK shall adhere to the above scheme. It is also being recommended to replace the existing license text in the code with SPDX-License-Identifiers.

Any exception to the DPDK IP policies shall be approved by DPDK Tech Board and DPDK Governing Board. Steps for any exception approval: 1. Mention the appropriate license identifier form SPDX. If the license is not

  listed in SPDX Licenses. It is the submitters responsibiliity to get it
  first listed.

2. Get the required approval from the DPDK Technical Board. Technical Board may

  advise the author to check alternate means first. If no other alternative
  are found and the merit of the contributions are important for DPDK's
  mission, it may decide on such exception with two-thirds vote of the members.

3. Technical Board then approach Governing Board for such limited approval for

  the given contribution only.

Any approvals shall be documented in "Licenses/exceptions.txt" with record dates.

DPDK project supported licenses are:

1. BSD 3-clause "New" or "Revised" License SPDX-License-Identifier: BSD-3-Clause URL: http://spdx.org/licenses/BSD-3-Clause#licenseText DPDK License text: licenses/bsd-3-clause.txt 2. GNU General Public License v2.0 only SPDX-License-Identifier: GPL-2.0 URL: http://spdx.org/licenses/GPL-2.0.html#licenseText DPDK License text: licenses/gpl-2.0.txt 3. GNU Lesser General Public License v2.1 SPDX-License-Identifieri: LGPL-2.1 URL: http://spdx.org/licenses/LGPL-2.1.html#licenseText DPDK License text: licenses/lgpl-2.1.txt