Zope Public License 2.1

Also known as ZPL-2.1, Zope Public License (ZPL) 2.1, Zope Public License 2.1.

Commercial use: allowed
Share alike: not required
Attribution: required (keep the copyright and license notices)

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Write this as a license text (needs an account) DALICC reads the model above and writes what it permits, requires and prohibits in plain English. Without an account, the Text download above writes the model out from the vocabulary.

Canonical URI https://dalicc.net/licenselibrary/ZPL-2.1

Permissions

Change license by library convention
Duties
- Use a compliant license by library convention
Charge distribution fee from the text
Commercial use from the text
Derivative works from the text
Derive from the text
Duties
- Attribution from the text
- Modification notice from the text
- Notice from the text
Display from the text
Distribute from the text
Duties
- Attribution from the text
- Notice from the text
Modified works from the text
Modify from the text
Duties
- Attribution from the text
- Modification notice from the text
- Notice from the text
Present from the text
Reproduce from the text

Prohibitions

Promote from the text

License-wide duties

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

What applies by default

The statements above are the library's reading of this license: each is marked with the sentence it rests on, or as a library convention where the text is not explicit. The statements below are the ones the DALICC reasoner supplies for acts the license says nothing about, from the default rules of the dependency graph it reasons with. Each one names the legal source it rests on. None of it is in the record.

No default rule of that graph reaches this license: it speaks about every act the rules are about.

Clauses

Warranty disclaimer

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

Limitation of liability

IN NO EVENT SHALL THE COPYRIGHT HOLDERS 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.

Additional clauses

4. The right to distribute this software or to use it for any purpose does not give you the right to use Servicemarks (sm) or Trademarks (tm) of the copyright holders. Use of them is covered by separate agreement with the copyright holders.

Info

Target asset types: Software
Region / jurisdiction: Worldwide
Validity: Perpetual
Source: https://spdx.org/licenses/ZPL-2.1.html
Legal code: http://old.zope.org/Resources/ZPL/
This description is published under: Creative Commons Attribution 4.0 International
SPDX identifier: ZPL-2.1 on the SPDX license list
DALICC identifier: ZPL-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.

Use this license

Everything below is generated from this record. Replace the example address with the address of your own work.

JSON sidecar

{
  "license-uri": "https://dalicc.net/licenselibrary/ZPL-2.1",
  "license-title": "Zope Public License 2.1",
  "spdx-id": "ZPL-2.1",
  "attribution": "Copyright (c) [year] [copyright holder]",
  "asset": null,
  "generated-by": "DALICC"
}

RDF, Turtle

@prefix cc: <http://creativecommons.org/ns#> .

<https://example.org/my-work>
    cc:license <https://dalicc.net/licenselibrary/ZPL-2.1> .

RDF, JSON-LD

{
  "@context": {
    "cc": "http://creativecommons.org/ns#"
  },
  "@id": "https://example.org/my-work",
  "cc:license": {
    "@id": "https://dalicc.net/licenselibrary/ZPL-2.1"
  }
}

HTML attribution

<p>This work is licensed under <a href="https://dalicc.net/licenselibrary/ZPL-2.1" rel="license">Zope Public License 2.1</a>.</p>

This license asks for attribution, so the credit line is part of it.

Badge

Markdown

[![License: Zope Public License 2.1](https://dalicc.net/license-library/ZPL-2.1/badge.svg)](https://dalicc.net/license-library/ZPL-2.1)

HTML

<a href="https://dalicc.net/license-library/ZPL-2.1"><img src="https://dalicc.net/license-library/ZPL-2.1/badge.svg" alt="License: Zope Public License 2.1"></a>

Review

Written from the license text by: Giray Havur
Written on: 2026-09-15
Second review: not yet done
Record changed since this review: yes (version 2, 2026-09-24)
Findings: 8 recorded, 7 applied to the record, 0 proposed

Models version 2.1 of the Zope Public License, which is version 2.0 with every reference to Zope Corporation replaced by a reference to the copyright holders named in the accompanying notice. The deontic model is identical to ZPL-2.0. Nothing here is legal advice.

8 findings

major Rubric 3 odrl:permission applied

The grant is unchanged from 2.0: "Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met".
major Rubric 4 odrl:prohibition applied

Clause 3 now reads "Names of the copyright holders must not be used to endorse or promote products derived from this software without prior written permission from the copyright holders", which is the same dalicc:promote prohibition applied to a generic licensor. dalicc:ChangeLicense is prohibited as on ZPL-2.0. (Corrected on 2026-09-15 by the verification pass: see the rubric 3 finding on relicensing below.)
major Rubric 5 odrl:duty applied

Clauses 1 and 2 require "the accompanying copyright notice, this list of conditions, and the following disclaimer" to be retained, which is cc:Attribution and cc:Notice, and clause 5 keeps the change-notice requirement, which is dalicc:modificationNotice. The duty set is identical to ZPL-2.0.
minor Rubric 6 dalicc:additionalClauses applied

Clause 4 is quoted verbatim; it now refers to the Servicemarks and Trademarks "of the copyright holders" and to a separate agreement with them rather than to the Zope Marks page. The warranty and liability sentences are split into their own predicates.
info Rubric 7 cc:jurisdiction applied

The text names no legal system and sets no term, so cc:jurisdiction is dalicc:worldwide and dalicc:validityType is dalicc:perpetual.
info Rubric 9 record none

The consistency check of app.services.composer with the dependency graph dg_default returned an empty conflict list.
major Rubric 10 record applied

Diffed against ZPL-2.0. Every difference is the generalisation from Zope Corporation to the copyright holders, plus the dropping of the closing credits paragraph. The two records therefore carry the same permissions, prohibitions and duties, and the separation is justified only by the different licensor wording. No cc:attributionName and no dct:publisher are written, because the 2.1 text names no licensor.
major Rubric 3 odrl:permission applied

Library convention 15: a licence that asks for no reciprocity and no source code asks only that the notice travels with the copy, which is a duty on the acts it governs and not a bar on putting the copy under other terms. dalicc:ChangeLicense is therefore a permission here, and the prohibition the earlier reading wrote is removed. The text reads: "Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions in source code must retain the accompanying copyright notice, this list of conditions, and the following disclaimer." The permission carries the dalicc:compliantLicense duty, as Apache-2.0 does, because the notice has to survive the relicensing.

Report an issue The review record as JSON The review checks the model against the license text. It is not legal advice.

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.

Version 2 current2026-09-24 Giray Havur

The changes since version 1 recorded which sentence of the text each statement rests on, named the license the record itself is published under and removed the quotes that do not name the act they support.

View version 2 JSON-LD Turtle RDF/XML
9 changes
- changed permission dalicc:ChangeLicense with duties [dalicc:compliantLicense]
  
  was permission dalicc:ChangeLicense with duties [dalicc:compliantLicense]
  
  Manual edit The statement is marked as a library convention, family rule 15: Permissive records permit relicensing: the text does not state it in as many words. Its duty dalicc:compliantLicense is marked as a library convention, family rule 15: Permissive records permit relicensing.
- changed permission odrl:derive with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  was permission odrl:derive with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  Manual edit Its duty cc:Attribution quotes "Redistributions in source code must retain the accompanying copyright notice, this list of conditions, and the following disclaimer."
- changed permission odrl:distribute with duties [cc:Attribution, cc:Notice]
  
  was permission odrl:distribute with duties [cc:Attribution, cc:Notice]
  
  Manual edit Its duty cc:Attribution quotes "Redistributions in source code must retain the accompanying copyright notice, this list of conditions, and the following disclaimer."
- changed permission odrl:modify with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  was permission odrl:modify with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  Manual edit Its duty cc:Attribution quotes "Redistributions in source code must retain the accompanying copyright notice, this list of conditions, and the following disclaimer."
- changed prohibition dalicc:promote
  
  was prohibition dalicc:promote
  
  Manual edit The statement now quotes the sentence of the licence text it rests on: "Names of the copyright holders must not be used to endorse or promote products derived from this software without prior written permission from the copyright holders."
- 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.
- changed permission odrl:derive with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  was permission odrl:derive with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  Manual edit Removed the quoted evidence of duty cc:Attribution on odrl:derive, duty cc:Attribution on odrl:distribute, duty cc:Attribution on odrl:modify: the quoted sentence does not name the act. The statements stay, read from the text without a linked quote.
- changed permission odrl:distribute with duties [cc:Attribution, cc:Notice]
  
  was permission odrl:distribute with duties [cc:Attribution, cc:Notice]
  
  Manual edit Removed the quoted evidence of duty cc:Attribution on odrl:derive, duty cc:Attribution on odrl:distribute, duty cc:Attribution on odrl:modify: the quoted sentence does not name the act. The statements stay, read from the text without a linked quote.
- changed permission odrl:modify with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  was permission odrl:modify with duties [cc:Attribution, cc:Notice, dalicc:modificationNotice]
  
  Manual edit Removed the quoted evidence of duty cc:Attribution on odrl:derive, duty cc:Attribution on odrl:distribute, duty cc:Attribution on odrl:modify: the quoted sentence does not name the act. The statements stay, read from the text without a linked quote.
Version 1

Created from the license text on 2026-09-15 (Python, PHP, Unicode and W3C).

View version 1 JSON-LD Turtle RDF/XML

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.