EventCatalog License
EventCatalog version 5.0 and later is licensed under the Business Source License 1.1, with the parameters and Additional Use Grant set out below. This is the same text published as the LICENSE file in the EventCatalog repository.
Earlier releases remain available under the MIT License. Their notice is reproduced in NOTICE below.
For plain-English guidance, see the License FAQ. The guidance is for information only. If it differs from the license, the license applies. For commercial licensing, see pricing or contact hello@eventcatalog.dev.
License
License text copyright (c) 2024 MariaDB plc, All Rights Reserved.
"Business Source License" is a trademark of MariaDB plc.
Parameters
Licensor: EventCatalog Ltd, a company registered in England and
Wales (company number 15764703).
Licensed Work: EventCatalog version 5.0 or later, including pre-releases,
as published by the Licensor in this repository and as the
npm package @eventcatalog/core, other than any file,
directory or package that states it is licensed under a
different license. The following are licensed under the
MIT License and are not part of the Licensed Work:
packages/sdk, packages/cli, packages/connectors,
packages/diff, packages/linter, packages/visualiser,
packages/breaking-changes, packages/create-eventcatalog
and the examples directory. The Licensed Work is (c) 2026
EventCatalog Ltd.
Additional Use Grant: You may make Production use of the Licensed Work if You
qualify for Free Use and Your use is not a Hosted
Offering. Sections 1 to 7 below form part of this grant.
Capitalised terms are defined in section 6.
1. Free Use
You qualify for "Free Use" if You are:
(a) an individual using the Licensed Work for Your own
personal purposes, and not for or on behalf of any
Organisation (including Your employer or Your own
business);
(b) an Organisation whose Annual Revenue is less than USD
10,000,000 (ten million US dollars) and whose Total
Funding is less than USD 10,000,000;
(c) a person or Organisation using the Licensed Work
solely to document a Public Open Source Project;
(d) a school, college or university recognised by the
education authorities of its country, using the
Licensed Work solely for teaching or academic
research, and not for its administrative or commercial
operations; or
(e) an Organisation in its Evaluation Period.
2. Growing past the thresholds
An Organisation that qualifies for Free Use under 1(b)
continues to qualify until ninety (90) days after the
first of the following to happen:
(a) the end of the first financial year in which its
Annual Revenue reaches USD 10,000,000; or
(b) the date on which its Total Funding reaches USD
10,000,000; or
(c) the date on which a change in its Affiliates (for
example an acquisition) takes it over either
threshold.
3. Working for clients
If You use the Licensed Work for a client's benefit (for
example as a consultant, contractor, agency or software
vendor), including building, customising, hosting or
distributing the Licensed Work or a catalog built with it
for that client, Your use for that client is permitted if
the client qualifies for Free Use or holds a Commercial
License covering that use. You may rely on a client's
written statement of its status unless You know it is
wrong. Your own use of the Licensed Work for Your own
systems is judged on Your own status.
4. Coming into compliance
(a) If You stop qualifying for Free Use (for example
because Your Evaluation Period ends), or You become
aware (including by notice from the Licensor) that
Your Production use is not permitted by this grant,
You may continue that use for thirty (30) days (the
"Cure Period") in order to obtain a Commercial License
or stop that use. Use during the Cure Period is
permitted Production use, is not a violation of this
License, and Your rights under this License do not
terminate during the Cure Period for that reason. One
Cure Period applies to each such event; stopping and
later resuming substantially the same use does not
create a new one.
(b) Production use that was not permitted, but that You
made before You knew or reasonably ought to have known
that it was not permitted, is treated as permitted
Production use if You obtain a Commercial License or
stop that use within the Cure Period.
(c) For a Hosted Offering, the Cure Period is available
only once, starts only on notice from the Licensor,
and section 4(b) does not apply.
5. Guidance and Commercial Licenses
The Licensor publishes guidance on this License at
https://www.eventcatalog.dev/license-faq. The guidance is
for information only. It does not form part of this
License and does not change it. If the guidance and this
License differ, this License applies.
A Commercial License or other written permission from the
Licensor may permit uses not covered by this grant. A
Commercial License held by a vendor or distributor does
not cover its customers' Production use unless it
expressly says so.
6. Definitions
"You" means the individual or Organisation exercising
rights under this License, and has the same meaning as
"you" in the Terms below.
"Organisation" means any company, partnership, sole
trader, trust, government or public body, or other entity
or undertaking, together with all of its Affiliates. A
government or public body is treated as an Organisation at
the level of the individual body (for example a ministry,
department, agency, local authority or health trust), not
the wider government of which it forms part.
"Affiliate" means any entity that controls, is controlled
by, or is under common control with another, where
"control" means owning more than fifty percent (50%) of
the voting interests or otherwise having the power to
direct its management and policies. Two entities are not
Affiliates of each other solely because both are owned or
controlled by (i) a government or public body, or (ii) an
investment fund or other financial investor that does not
include them in its own consolidated financial statements.
"Annual Revenue" means the total gross revenue (or, for a
business such as a bank or insurer that does not report
revenue in that form, the nearest equivalent measure of
its total income) of the whole Organisation for its most
recently completed financial year, taken from consolidated
financial statements where they exist and otherwise by
adding together the figures for each member. For a
government or public body, charity or non-profit
organisation, it means the greater of its total income
(including grants and donations) and its total annual
budget for that year. An Organisation that has not
completed a financial year uses its reasonably projected
figure for its first year. Amounts in other currencies are
converted to US dollars at the average exchange rate for
that year from a recognised published source.
"Total Funding" means the total amount of equity
investment, and of convertible or other investment
intended to convert into equity (such as convertible notes
or SAFEs), that the whole Organisation has received from
investors outside the Organisation since it was formed,
measured at the amounts invested. It does not include
revenue, government or charitable grants, or loans and
other debt.
"Production use" means any use of the Licensed Work other
than (i) trying it out with sample, test or throwaway
content that no one relies on, or (ii) developing, testing
or contributing to the Licensed Work itself. It includes
running a catalog built with the Licensed Work that an
Organisation's employees, contractors or automated systems
(including AI agents) use or rely on to document,
discover, understand or govern its software systems,
whether that catalog is available internally, privately or
publicly, and using the Licensed Work in continuous
integration or deployment pipelines to build, update or
validate such a catalog. Use is Production use if it meets
this definition, whatever the catalog, environment or
project is called (including "evaluation", "pilot", "proof
of concept" or "internal").
"Evaluation Period" means the sixty (60) days starting on
the date an Organisation first makes Production use of any
version of the Licensed Work, or any longer period the
Licensor agrees in writing. Each Organisation, including
all of its Affiliates, has one Evaluation Period in total
across all versions of the Licensed Work. Upgrading,
reinstalling, creating another catalog, or a change in the
Organisation's Affiliates does not start a new Evaluation
Period. If two Organisations that have each started an
Evaluation Period become Affiliates, the earlier period
applies to the combined Organisation.
"Public Open Source Project" means a software project
whose source code is publicly available under a license
approved by the Open Source Initiative, where the catalog
documents only that project's software and not the systems
of an Organisation.
"Hosted Offering" means using the Licensed Work to give
third parties access to the Licensed Work, or to a catalog
built with it, as a hosted, managed or multi-tenant
service, whether or not for a fee, and whether offered on
its own or as part of another product. Members of Your
Organisation are not third parties. The following are not
Hosted Offerings:
(a) publishing a catalog that documents Your own software
systems, including making it publicly accessible to
Your customers, partners or the public;
(b) hosting a catalog for a specific client under section
3 as part of services You provide to that client,
where the catalog documents that client's software
systems and You do not offer hosting of the Licensed
Work as a standardised or self-service product; and
(c) hosting, without charge, catalogs that document only
Public Open Source Projects.
"Commercial License" means a written license from the
Licensor, including one accepted online, permitting
Production use beyond this grant.
7. Everything else
All other Production use requires a Commercial License.
Nothing in this grant limits the rights granted in the
Terms below, including the right to copy, modify,
redistribute and make non-production use of the Licensed
Work. The content of Your own catalog (the documentation,
schemas, diagrams and configuration You create) is Yours
and is not part of the Licensed Work.
Change Date: Four years after the first public release (including any
pre-release) in the same release series as the Licensed
Work.
A "release series" is every release that shares the same
major and minor release number, including its pre-releases
and patch releases: for example, 5.1 includes
5.1.0-beta.1, 5.1.0 and 5.1.3, and they all share one
Change Date. Unreleased builds, such as individual commits
or nightly builds, belong to the next release series to be
released.
Change License: MIT
For information about commercial licensing of the Licensed Work, please
contact hello@eventcatalog.dev.
Portions of the Licensed Work were previously released under the MIT License.
Those prior releases remain available under the MIT License, and their
copyright and permission notices are preserved in NOTICE.
Notice
The Business Source License (this document, or the "License") is not an Open
Source license. However, the Licensed Work will eventually be made available
under an Open Source License, as stated in this License.
Business Source License 1.1
Terms
The Licensor hereby grants you the right to copy, modify, create derivative
works, redistribute, and make non-production use of the Licensed Work. The
Licensor may make an Additional Use Grant, above, permitting limited production use.
Effective on the Change Date, or the fourth anniversary of the first publicly
available distribution of a specific version of the Licensed Work under this
License, whichever comes first, the Licensor hereby grants you rights under
the terms of the Change License, and the rights granted in the paragraph
above terminate.
If your use of the Licensed Work does not comply with the requirements
currently in effect as described in this License, you must purchase a
commercial license from the Licensor, its affiliated entities, or authorized
resellers, or you must refrain from using the Licensed Work.
All copies of the original and modified Licensed Work, and derivative works
of the Licensed Work, are subject to this License. This License applies
separately for each version of the Licensed Work and the Change Date may vary
for each version of the Licensed Work released by Licensor.
You must conspicuously display this License on each original or modified copy
of the Licensed Work. If you receive the Licensed Work in original or
modified form from a third party, the terms and conditions set forth in this
License apply to your use of that work.
Any use of the Licensed Work in violation of this License will automatically
terminate your rights under this License for the current and all other
versions of the Licensed Work.
This License does not grant you any right in any trademark or logo of
Licensor or its affiliates (provided that you may use a trademark or logo of
Licensor as expressly required by this License).
TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON
AN "AS IS" BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS,
EXPRESS OR IMPLIED, INCLUDING (WITHOUT LIMITATION) WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND
TITLE.
MariaDB hereby grants you permission to use this License's text to license
your works, and to refer to it using the trademark "Business Source License",
as long as you comply with the Covenants of Licensor below.
Covenants of Licensor
In consideration of the right to use this License's text and the "Business
Source License" name and trademark, Licensor covenants to MariaDB, and to all
other recipients of the licensed work to be provided by Licensor:
1. To specify as the Change License the GPL Version 2.0 or any later version,
or a license that is compatible with GPL Version 2.0 or a later version,
where "compatible" means that software provided under the Change License can
be included in a program with software provided under GPL Version 2.0 or a
later version. Licensor may specify additional Change Licenses without
limitation.
2. To either: (a) specify an additional grant of rights to use that does not
impose any additional restriction on the right granted in this License, as
the Additional Use Grant; or (b) insert the text "None".
3. To specify a Change Date.
4. Not to modify this License in any other way.
NOTICE
EventCatalog
Copyright (c) 2026 EventCatalog Ltd
Portions of the Licensed Work were previously released under the MIT License.
Those prior releases remain available under the MIT License, and their
copyright and permission notice is preserved below.
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MIT License
Copyright (c) 2022-2026 boyney123
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
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.