          Collaborative Standards Software License v1.0 (CSSL)

LICENSE TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION OF
OPENAIRINTERFACE. The pdf version of this document can be downloaded from
https://openairinterface.org/oai-cssl/.

1. Definitions.

“License” shall mean the terms and conditions for use, reproduction, and
distribution set forth in this document.

“Licensor” shall mean the copyright owner or entity authorized by the copyright
owner that is granting the License.

“Legal Entity” shall mean the union of the acting entity and all other entities
that control, are controlled by, or are under common control with that entity.
For the purposes of this definition, “control” means (i) the power, direct or
indirect, to cause the direction or management of such entity, whether by
contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.

“You” (or “Your”) shall mean an individual or Legal Entity exercising
permissions granted by this License.

“Source” form shall mean the preferred form for making modifications, including
but not limited to software source code, documentation source, and configuration
files.

“Object” form shall mean any form resulting from mechanical transformation or
translation of a Source form, including but not limited to compiled object code,
generated documentation, and conversions to other media types.

“Work” shall mean the work of authorship, whether in Source or Object form, made
available under the License, as indicated by a copyright notice that is included
in or attached to the work (an example is provided in the Appendix below).

“Derivative Works” shall mean any work, whether in Source or Object form, that
is based on (or derived from) the Work and for which the editorial revisions,
annotations, elaborations, or other modifications represent, as a whole, an
original work of authorship. For the purposes of this License, Derivative Works
shall not include works that remain separable from, or merely link (or bind by
name) to the interfaces of, the Work and Derivative Works thereof.

“Contribution” shall mean any work of authorship that is intentionally submitted
to Licensor for inclusion in the Work by the copyright owner or by an individual
or Legal Entity authorized to submit on behalf of the copyright owner. For the
purposes of this definition, “submitted” means any form of electronic, or
written communication sent to the Licensor or its representatives, including but
not limited to communication on electronic mailing lists, source code control
systems, and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work but excluding
communication that is conspicuously marked or otherwise designated in writing by
the copyright owner or entity authorized by the copyright owner as "Not a
Contribution."

“Contributor License Agreement” shall mean the agreement signed by any
Contributor setting forth the terms and conditions applicable to its
Contribution.

“Contributor” shall mean any individual or Legal Entity on behalf of whom a
Contribution has been received by Licensor and subsequently incorporated within
the Work.

2. Grant of Copyright License.

Subject to the terms and conditions of this License, Licensor and each
Contributor hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable copyright license to reproduce, prepare
Derivative Works of, publicly display, publicly perform, and distribute the Work
and such Derivative Works in Source or Object form.

3. Grant of Patent License.

3.1 Grant of Patent License for study, testing and research purposes:

Subject to the terms and conditions of this License, Licensor and each
Contributor hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section) patent
license to make, have made, use, and otherwise transfer (excluding selling) the
Work, solely for study, testing and research purposes, where such license
applies only to those patent claims licensable by Licensor or such Contributor
that are necessarily infringed respectively by the Work and/or the said
Contributor Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted (“Essential Patents”).

3.2 Grant of Patent License for purposes other than study, testing and research:

For purposes other than study, testing and research, and subject to the terms
and conditions of this License, You commit to be prepared to negotiate, in good
faith, a non-exclusive, nontransferable, non-assignable license of Essential
Patents with each Contributor and/or the Licensor on Fair, Reasonable and
Non-Discriminatory (“FRAND”) terms and conditions for the use of the Work or
Contribution(s) incorporated within the Work.

3.3 Patent Litigation

If You institute patent litigation against any entity making use of the Work
solely for study, testing and research purposes (including a cross-claim or
counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated
within the Work constitutes direct or contributory patent infringement, then the
patent licenses granted to You under section 3.1 of this License for that Work
shall terminate as of the date such litigation is filed.

4. Sublicensing

You may grant sublicenses under the licenses granted under sections 2 and 3.1
provided that the sublicense is subject to and inclusive of all the terms of and
rights under this License to which the Work is or was distributed.

5. Redistribution

Subject to terms and conditions set forth in sections 2 and 3, You may reproduce
and distribute copies of the Work or Derivative Works thereof in any medium,
with or without modifications, and in Source or Object form, provided that You
meet the following conditions:

1. You must give any other recipients of the Work or Derivative Works a copy of
this License; and

2. You must cause any modified files by You to carry prominent notices stating
that You changed the files; and

3. You must retain, in the Source form of any Derivative Works that You
distribute, all copyright, patent, trademark, and attribution notices from the
Source form of the Work, excluding those notices that do not pertain to any part
of the Derivative Works; and

4. If the Work includes a “NOTICE” text file as part of its distribution, then
any Derivative Works that You distribute must include a readable copy of the
attribution notices contained within such NOTICE file, excluding those notices
that do not pertain to any part of the Derivative Works, in at least one of the
following places: within a NOTICE text file distributed as part of the
Derivative Works; within the Source form or documentation, if provided along
with the Derivative Works; or, within a display generated by the Derivative
Works, if and wherever such third-party notices normally appear. The contents of
the NOTICE file are for informational purposes only and do not modify the
License. You may add Your own attribution notices within Derivative Works that
You distribute, alongside or as an addendum to the NOTICE text from the Work,
provided that such additional attribution notices cannot be construed as
modifying the License.

You may add Your own copyright statement to Your modifications and may provide
additional or different license terms and conditions for use, reproduction, or
distribution of Your modifications, or for any such Derivative Works as a whole,
provided Your use, reproduction, and distribution of the Work otherwise complies
with the conditions stated in this License.

6. Submission of Contributions.

Any contribution intentionally submitted for inclusion in the Work by You to the
Licensor shall be under the terms and conditions of this License, without any
additional terms or conditions.  Notwithstanding the above, nothing herein shall
supersede or modify the terms of any separate license agreement such as the
Contributor License Agreement You may have executed with Licensor regarding such
Contributions.

7. Trademarks.

This License does not grant permission to use the trade names, trademarks,
service marks, or product names of the Licensor, except as required for
reasonable and customary use in describing the origin of the Work and
reproducing the content of the NOTICE file.

8. Disclaimer of Warranty.

Unless required by applicable law or agreed to in writing, Licensor provides the
Work (and each Contributor provides its Contributions) on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
including, without limitation, any warranties or conditions of TITLE,
NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
solely responsible for determining the appropriateness of using or
redistributing the Work and assume any risks associated with your exercise of
permissions under this License.

9. Limitation of Liability.

In no event and under no legal theory, whether in tort (including negligence),
contract, or otherwise, unless required by applicable law (such as deliberate
and grossly negligent acts) or agreed to in writing, shall Licensor and any
Contributor, as such, be liable to You for damages, including any direct,
indirect, special, incidental, or consequential damages of any character arising
as a result of this License or out of Your use or inability to use the Work
(including but not limited to damages for loss of goodwill, work stoppage,
computer failure or malfunction, or any and all other commercial damages or
losses), even if such Contributor has been advised of the possibility of such
damages.

10. Accepting Warranty or Additional Liability.

While redistributing the Work or Derivative Works thereof, You may choose to
offer, and charge a fee for, acceptance of support, warranty, indemnity, or
other liability obligations and/or rights consistent with this License. However,
in accepting such obligations, You may act only on Your own behalf and on Your
sole responsibility, not on behalf of any other Contributor and/or the Licensor,
and only if You agree to indemnify, defend, and hold each Contributor and/or the
Licensor harmless for any liability incurred by, or claims asserted against,
such Contributor and/or Licensor by reason of Your accepting any such warranty
or additional liability obligations.

END OF TERMS AND CONDITIONS

1. APPENDIX: How to apply the PRESENT License to your work

To apply the present License to your work, attach the following boilerplate
notice, with the fields enclosed by brackets “[]” replaced with your own
identifying information. (Don’t include the brackets!) The text should be
enclosed in the appropriate comment syntax for the file format. We also
recommend that a file or class name and description of purpose be included on
the same “printed page” as the copyright notice for easier identification within
third-party archives.

Copyright [yyyy] [name of copyright owner]

Licensed under the Standards Software License, version 1.0, terms and conditions
(the “License”); you may not use this file except in compliance with the
License. You may obtain a copy of the License at [URL link]

Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and limitations
under the License.
