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2026

Archived version 1 of 2. This is how the model read before it was corrected. It is shown read only. The current version is here.

OSET Public License version 2.1

Also known as OSET Public License 2.1, OSET Public License version 2.1, OSET-PL-2.1.

Commercial use
allowed
Share alike
required
Attribution
required (keep the copyright and license notices)
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Canonical URI https://dalicc.net/licenselibrary/OSET-PL-2.1

Permissions

  • Change license from the text Replacing the license of the work, or of an adaptation, with another license, or changing its terms.
  • Charge distribution fee from the text Charging a fee for the act of providing a copy of the work to someone else.
  • Commercial use from the text Using the work to generate income, directly or indirectly, for example by selling it or by using it in advertising.
  • Conditional add limitation from the text Adding a further condition to the license terms only in the narrow circumstances the license names, such as a statute, a court order or national security.
  • Derivative works from the text Distributing an adaptation of the work and making it available to the public.
  • Derive from the text Creating a new work from the work, such as a translation, adaptation or arrangement of it or of a part of it.

    Duties

    • Attribution from the text Giving credit to the copyright holders or authors of the work, in the form the licensor asks for.
    • Modification notice from the text Marking a changed work as changed, saying how it differs from the original and keeping earlier notices of change.
    • Notice from the text Notice: keeping the license and copyright notices with every copy.
    • Share alike from the text Adaptations have to be licensed under the same license or one the license names as compatible.
    • Source code from the text Providing access to the source code of the work with every copy distributed.
  • Display from the text Showing the work to the public without making a copy the viewer keeps.
  • Distribute from the text Providing copies of the work to the public or to anyone else.

    Duties

    • Attribution from the text Giving credit to the copyright holders or authors of the work, in the form the licensor asks for.
    • Notice from the text Notice: keeping the license and copyright notices with every copy.
    • Share alike from the text Adaptations have to be licensed under the same license or one the license names as compatible.
    • Source code from the text Providing access to the source code of the work with every copy distributed.
  • Modified works from the text Distributing a modified version of the work that does not amount to a new, derivative work.
  • Modify from the text Altering the work, for example by updating it, without creating a new work; an alteration that creates a new work is Derive.

    Duties

    • Attribution from the text Giving credit to the copyright holders or authors of the work, in the form the licensor asks for.
    • Modification notice from the text Marking a changed work as changed, saying how it differs from the original and keeping earlier notices of change.
    • Notice from the text Notice: keeping the license and copyright notices with every copy.
    • Share alike from the text Adaptations have to be licensed under the same license or one the license names as compatible.
    • Source code from the text Providing access to the source code of the work with every copy distributed.
  • Patent grant from the text Granting a license under the patent claims that a contributor holds and that the contribution necessarily infringes.
  • Present from the text Performing the work in public, including by broadcast or other communication to the public.
  • Reproduce from the text Making copies of the work in any form.
  • Sublicense from the text Granting a third party rights in the work under a license of the licensee's own, rather than passing on the original license.

Prohibitions

  • Promote from the text Not permitted: Promote. Using the name or trademarks of the licensor or of contributors to endorse or promote a product.

License-wide duties

This license states no duties that apply to the work as a whole.

Further terms

These are the things the license says about itself beyond the acts it permits, forbids and requires: when it ends, how long there is to put a breach right, which law governs it, and so on. A term that comes from the DALICC vocabulary links to its definition.

Patent license ends if you sue
Yes. Not a ban on suing: a patent claim over the work ends the patent license, or the whole license, as the text provides.
Terminates on breach
Yes

Clauses

Warranty disclaimer

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.

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.

Additional clauses

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. 5.2 Patent Infringement Claims 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. 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. Government Terms 9.1 Commercial Item The Covered Software is a “commercial item,” as that term is defined in 48 C.F.R. 2.101 (Oct. 1995), consisting of “commercial computer software” and “commercial computer software documentation,” as such terms are used in 48 C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all U.S. Government End Users acquire Covered Software with only those rights set forth herein. 9.2 No Sovereign Immunity The U.S. federal government and states that use or distribute Covered Software hereby waive their sovereign immunity with respect to enforcement of the provisions of this License. 9.3 Choice of Law and Venue 9.3.1 If You are a government of a state of the United States, or Your use of the Covered Software is pursuant to a procurement contract with such a state government, this License shall be governed by the law of such state, excluding its conflict-of-law provisions, and the adjudication of disputes relating to this License will be subject to the exclusive jurisdiction of the state and federal courts located in such state. 9.3.2 If You are an agency of the United States federal government, or Your use of the Covered Software is pursuant to a procurement contract with such an agency, this License shall be governed by federal law for all purposes, and the adjudication of disputes relating to this License will be subject to the exclusive jurisdiction of the federal courts located in Washington, D.C. 9.3.3 You may alter the terms of this Section 9.3 for this License as described in Section 3.5.2. 9.4 Supremacy This Section 9 is in lieu of, and supersedes, any other Federal Acquisition Regulation, Defense Federal Acquisition Regulation, or other clause or provision that addresses government rights in computer software under this License.

Info

Target asset types
Software
Region / jurisdiction
Worldwide
Validity
Perpetual
Source
https://spdx.org/licenses/OSET-PL-2.1.html
Legal code
http://www.osetfoundation.org/public-license
This description is published under
https://dalicc.net/licenselibrary/CC-BY-4.0
Publisher
Open Source Election Technology Foundation
Attribution name
Open Source Election Technology Foundation
SPDX identifier
OSET-PL-2.1 on the SPDX license list
DALICC identifier
OSET-PL-2.1

This record is published under CC BY 4.0. Credit it as: DALICC License Library, DALICC - Verein zur Förderung der Rechtssicherheit in der Datenbewirtschaftung, https://dalicc.net, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). The license it describes belongs to its publisher.

History

This license model has 2 versions. Version 2 is the one served today; every earlier version keeps its own address, so a conclusion drawn from one of them can still be checked against it.

  1. Version 2 current2026-09-24 Giray Havur

    The changes since version 1 recorded which sentence of the text each statement rests on and named the license the record itself is published under.

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    4 changes

    • changed permission dalicc:sublicense

      was permission dalicc:sublicense

      Manual edit The statement now quotes the sentence of the licence text it rests on: "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."

    • changed permission odrl:derive with duties [cc:Attribution, cc:Notice, cc:ShareAlike, cc:SourceCode, dalicc:modificationNotice]

      was permission odrl:derive with duties [cc:Attribution, cc:Notice, cc:ShareAlike, cc:SourceCode, dalicc:modificationNotice]

      Manual edit Its duty dalicc:modificationNotice quotes "You must cause any of Your Modifications to carry prominent notices stating that You changed the files."

    • changed permission odrl:modify with duties [cc:Attribution, cc:Notice, cc:ShareAlike, cc:SourceCode, dalicc:modificationNotice]

      was permission odrl:modify with duties [cc:Attribution, cc:Notice, cc:ShareAlike, cc:SourceCode, dalicc:modificationNotice]

      Manual edit Its duty dalicc:modificationNotice quotes "You must cause any of Your Modifications to carry prominent notices stating that You changed the files."

    • added dct:license <https://creativecommons.org/licenses/by/4.0/>

      Manual edit Every record is published under CC BY 4.0. cc:license names the record DALICC keeps of that licence; dct:license now names it by the address Creative Commons publishes it at, so that a consumer matching the canonical IRI finds it.

  2. Version 1

    Created from the license text on 2026-09-15 (Mozilla and CDDL).

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Every change names the reason behind it: a finding of the content review, one of its library-wide decisions, the metadata that review wrote onto every record, or a hand edit. None of it is legal advice.

Nothing on this page is legal advice. What a license means is decided by its text; ask a legal advisor before you rely on it.