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Mozilla Public License Version 2.0
==================================
1. Definitions
--------------
1.1. "Contributor"
means each individual or legal entity that creates, contributes to
the creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used
by a Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached
the notice in Exhibit A, the Executable Form of such Source Code
Form, and Modifications of such Source Code Form, in each case
including portions thereof.
1.5. "Incompatible With Secondary Licenses"
means
(a) that the initial Contributor has attached the notice described
in Exhibit B to the Covered Software; or
(b) that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the
terms of a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in
a separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible,
whether at the time of the initial grant or subsequently, any and
all of the rights conveyed by this License.
1.10. "Modifications"
means any of the following:
(a) any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered
Software; or
(b) any new file in Source Code Form that contains any Covered
Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the
License, by the making, using, selling, offering for sale, having
made, import, or transfer of either its Contributions or its
Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU
Lesser General Public License, Version 2.1, the GNU Affero General
Public License, Version 3.0, or any later versions of those
licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that
controls, is controlled by, or is under common control with You. For
purposes of this definition, "control" means (a) the power, direct
or indirect, to cause the direction or management of such entity,
whether by contract or otherwise, or (b) ownership of more than
fifty percent (50%) of the outstanding shares or beneficial
ownership of such entity.
2. License Grants and Conditions
--------------------------------
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
(a) under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
(b) under Patent Claims of such Contributor to make, use, sell, offer
for sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
(a) for any code that a Contributor has removed from Covered Software;
or
(b) for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
(c) under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights
to grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
in Section 2.1.
3. Responsibilities
-------------------
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
(a) such Covered Software must also be made available in Source Code
Form, as described in Section 3.1, and You must inform recipients of
the Executable Form how they can obtain a copy of such Source Code
Form by reasonable means in a timely manner, at a charge no more
than the cost of distribution to the recipient; and
(b) You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter
the recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software, except that You may alter any license notices to
the extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
---------------------------------------------------
If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: (a) comply with
the terms of this License to the maximum extent possible; and (b)
describe the limitations and the code they affect. Such description must
be placed in a text file included with all distributions of the Covered
Software under this License. Except to the extent prohibited by statute
or regulation, such description must be sufficiently detailed for a
recipient of ordinary skill to be able to understand it.
5. Termination
--------------
5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated (a) provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and (b) on an
ongoing basis, if such Contributor fails to notify You of the
non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular
Contributor are reinstated on an ongoing basis if such Contributor
notifies You of the non-compliance by some reasonable means, this is the
first time You have received notice of non-compliance with this License
from such Contributor, and You become compliant prior to 30 days after
Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers) which
have been validly granted by You or Your distributors under this License
prior to termination shall survive termination.
************************************************************************
* *
* 6. Disclaimer of Warranty *
* ------------------------- *
* *
* Covered Software is provided under this License on an "as is" *
* basis, without warranty of any kind, either expressed, implied, or *
* statutory, including, without limitation, warranties that the *
* Covered Software is free of defects, merchantable, fit for a *
* particular purpose or non-infringing. The entire risk as to the *
* quality and performance of the Covered Software is with You. *
* Should any Covered Software prove defective in any respect, You *
* (not any Contributor) assume the cost of any necessary servicing, *
* repair, or correction. This disclaimer of warranty constitutes an *
* essential part of this License. No use of any Covered Software is *
* authorized under this License except under this disclaimer. *
* *
************************************************************************
************************************************************************
* *
* 7. Limitation of Liability *
* -------------------------- *
* *
* Under no circumstances and under no legal theory, whether tort *
* (including negligence), contract, or otherwise, shall any *
* Contributor, or anyone who distributes Covered Software as *
* permitted above, be liable to You for any direct, indirect, *
* special, incidental, or consequential damages of any character *
* including, without limitation, damages for lost profits, loss of *
* goodwill, work stoppage, computer failure or malfunction, or any *
* and all other commercial damages or losses, even if such party *
* shall have been informed of the possibility of such damages. This *
* limitation of liability shall not apply to liability for death or *
* personal injury resulting from such party's negligence to the *
* extent applicable law prohibits such limitation. Some *
* jurisdictions do not allow the exclusion or limitation of *
* incidental or consequential damages, so this exclusion and *
* limitation may not apply to You. *
* *
************************************************************************
8. Litigation
-------------
Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions.
Nothing in this Section shall prevent a party's ability to bring
cross-claims or counter-claims.
9. Miscellaneous
----------------
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides
that the language of a contract shall be construed against the drafter
shall not be used to construe this License against a Contributor.
10. Versions of the License
---------------------------
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses
If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.
Exhibit A - Source Code Form License Notice
-------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular
file, then You may include the notice in a location (such as a LICENSE
file in a relevant directory) where a recipient would be likely to look
for such a notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
---------------------------------------------------------
This Source Code Form is "Incompatible With Secondary Licenses", as
defined by the Mozilla Public License, v. 2.0.

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See LICENSE-MPL.txt for all code in node/, osdep/. service/, and everywhere else except ext/ and nonfree/.
See nonfree/LICENSE.md for all non-free ("source available") portions of this repository.
Code in ext/ is external code included for build convenience or backward compatibility and retains its original license.

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ZeroTier Release Notes ZeroTier Release Notes
====== ======
## 2025-07-XX -- Version 1.16.0 ## 2025-08-21 -- Version 1.16.0
* Network-Specific Relays
* It is now possible to designate one or more nodes as network-specific relays to be used in preference to roots for relayed traffic between members of a network. These nodes need not necessarily be members of the network.
* "Moons" are now removed in favor of network-specific relays. They have been considered deprecated and not recommended for over a year.
* License Changes * License Changes
* The core (`node/` and `include/`) and the service (`service/` and `osdep/`) are now under the Mozilla Public License (MPL). * The core (`node/` and `include/`) and the service (`service/` and `osdep/`) are now under the Mozilla Public License (MPL).
* The network controller (`controller/`) remains under the BUSL with a commercial use restriction and *is not built into the service by default*. Building this into the service changes the license -- `zerotier-one` built with the controller is BUSL licensed, not MPL, but without the controller it is MPL (an OSI compatible license). * The network controller (`controller/`) is now under a commercial source-available license.
* HELLO packets are now encrypted by default -- they do not contain any secret data, just version and public keys, but in some cases them being sent in plaintext violated reqirements. * Use `make ZT_NONFREE=1` to build non-MPL components.
* Building with `ZT_NONFREE=1` changes the license of the resulting executable to a proprietary commercial license vs. MPL.
* Default binary builds no longer contain the controller.
* Network-Specific Relays (preview / beta)
* It is now possible to designate one or more nodes as network-specific relays to be used in preference to roots for relayed traffic between members of a network. These nodes need not necessarily be members of the network.
* "Moons" are now considered even more extra *deprecated* and should not be used in new deployments.
* We will announce support for network-specific relays once we have worked with some users to test and performed more internal validation.
* HELLO packet encryption is now available by enabling the `encryptedHelloEnabled` settting in `local.conf`.
* HELLO packets contain no data, only public keys and very basic meta-data like protocol version information.
* Most users won't care about this, but if you require this for e.g. compliance reasons you can enable. This adds a small amount of CPU and bandwidth overhead to the HELLO sign-on process.
* Small Fixes * Small Fixes
* Code has been reformatted using `clang-format` with a `.clang-format` definition in the repo. Typing `make clang-format` executes this against all main core and service C++ files. * Code has been reformatted using `clang-format` with a `.clang-format` definition in the repo. Typing `make clang-format` executes this against all main core and service C++ files.
* Bridges are no longer counted toward multicast limits. * Bridges are no longer counted toward multicast limits.
* A flow designation issue in bridged traffic under multipath scenarios has been fixed. * A flow designation issue in bridged traffic under multipath scenarios has been fixed.
* Library version updates for OIDC and other features. * Library version updates for OIDC and other features.
* Repository cleanup.
* Antiquated and unused software update code removed for precautionary reasons. * Antiquated and unused software update code removed for precautionary reasons.
* Compiler warnings removed through removing use of deprecated functions on some platforms.
* Other minor bug fixes. * Other minor bug fixes.
---- ----

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# ZeroTier SOURCE-AVAILABLE LICENSE
Version 1.0
Copyright (c) 2025 ZeroTier, Inc.
## DEFINITIONS
"Software" means ZeroTier and all associated documentation, source code, object code, and any derivatives thereof.
"Non-Commercial Use" means use of the Software solely for:
- Personal, non-commercial purposes, in a non-commercial environment
- Educational or academic research purposes (for students, not for organizational use)
- Evaluation purposes for a period not exceeding 30 days
"Commercial Use" includes, but is not limited to:
- Any use of the Software by or for the benefit of a for-profit company
- Any use of the Software by or for the benefit of a government or military entity
- Any use of the Software by or for the benefit of a non-profit organization, or registered charity
- Use in a production, staging, or development environment for business purposes
- Offering paid or unpaid services powered by the Software
- Incorporation of the Software into any paid or unpaid product, platform, distribution or service
## LICENSE STRUCTURE
This software distribution includes components governed by different license terms:
- The "ZeroTier Agent" component is licensed under the Mozilla Public License 2.0 (MPL-2.0). See the LICENSE-MPL.txt file in project root for details.
- The "Controller" and other related components, located in the “nonfree” source directory, are licensed under this Source-Available License for Non-Commercial Use. Use of any of these components for Commercial Use requires a separate commercial license agreement with ZeroTier, Inc.
## GRANT OF LICENSE
### Non-Commercial License Grant
Permission is hereby granted, free of charge, to any person obtaining a copy of this Software, to use, copy, modify, and distribute the Software for Non-Commercial Use only, subject to the following conditions:
1. The above copyright notice and this license shall be included in all copies, modified versions and redistributions, in whole or in part of the Software.
2. The Software may not be used for Commercial Use without obtaining a separate commercial license.
3. Any modifications to the Software must be clearly noted in both the source code and documentation as such and must not be misrepresented as the original Software.
4. If you distribute the Software or any derivative works, you must retain all copyright, trademark, attribution notices, and this license text.
### Commercial License Requirement
ANY COMMERCIAL USE OF THIS SOFTWARE REQUIRES A SEPARATE COMMERCIAL LICENSE.
To obtain a commercial license, please contact:
sales@zerotier.com
https://www.zerotier.com/
## RESTRICTIONS
You may NOT:
- Use the Software for Commercial Use without a commercial license
- Remove or alter any proprietary notices, copyright or trademark statements, headers, metadata, logos, branding or other identifying information in the Software
- Use the trademarks, service marks, trade names, logos, or other brand identifiers of the copyright holder in a manner likely to cause confusion about the source, sponsorship, or endorsement of the Software without prior written permission
- Imply endorsement by the copyright holder, directly or indirectly, without written permission
## RESERVATION OF RIGHTS
All rights not expressly granted herein are reserved by the copyright holder. No rights or licenses are granted by implication, estoppel, or otherwise.
## NO PATENT LICENSE
This License does not grant any rights under any patent owned or controlled by the copyright holder. To inquire about patent licensing, please contact: legal@zerotier.com
## CONTRIBUTIONS
If you contribute any code, bug fixes, or enhancements to the Software, you grant the copyright holder a perpetual, worldwide, royalty-free license to use, modify, reproduce, sublicense, and distribute such contributions for any purpose, including Commercial Use.
## DISCLAIMER
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
## COMPLIANCE AND VERIFICATION
To ensure compliance with this License, you agree to provide, upon request, reasonable documentation demonstrating that your use of the Software qualifies as Non-Commercial Use. Failure to provide such documentation within 30 days may result in termination of this License.
## TERMINATION
This license automatically terminates if you:
- Use the Software for Commercial Use without obtaining a commercial license
- Fail to comply with any of the terms and conditions stated herein
- Initiate legal action against the copyright holder related to the Software
Upon termination, you must cease all use of the Software and destroy all copies in your possession.
## GOVERNING LAW
This License shall be governed by the laws of California, USA, without regard to conflict of law principles.
## ENFORCEMENT
The copyright holder reserves the right to enforce this License through legal or equitable remedies, including injunctive relief, in the event of a violation of its terms.
## ENTIRE AGREEMENT
This License constitutes the entire agreement between the parties concerning the use of the Software for Non-Commercial Use and supersedes all prior or contemporaneous agreements regarding such use.
---
## NOTICE TO USERS
This Software is source-available, but it is not “open source” as defined by the Open Source Initiative.
The "ZeroTier Agent" component is licensed under the Mozilla Public License 2.0 (MPL-2.0).
The "Controller" and related components, located in the “nonfree” source directory, are licensed under this Source-Available License.
Commercial use, as defined above, requires a paid commercial license.
For inquiries, please contact:
sales@zerotier.com
Or visit: https://www.zerotier.com/