UCUM Copyright Notice and License

Version 1.1, June 2024

The Unified Code for Units of Measure (UCUM), also known as the “UCUM Specification,” is copyright ©1999-2024, Regenstrief Institute, Inc. All rights reserved.


By exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Unified Code for Units of Measure (UCUM) Version 1.0 License. To the extent this License may be interpreted as a contract, You are granted the Licensed Rights in consideration of Your acceptance of these terms and conditions, and the Licensor grants You such rights in consideration of benefits the Licensor receives from making the Licensed Material available under these terms and conditions.

Section 1. Definitions.

1.1 “Contribution” shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, 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, verbal, 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 as “Not a Contribution.”

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

1.3 “Derivative Works” shall mean any work, in any 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 avoidance of doubt, a Software Application that merely communicates with and/or interoperates with an unmodified instance of the Work is not a Derivative Work.

1.4 “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.

1.5 “Licensed Rights” shall mean the rights granted to You subject to the terms and conditions of this License, which are limited to all copyrights that apply to Your use of the Work and that the Licensor has authority to license.

1.6 “License” shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.

1.7 “Licensor” shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. Regenstrief Institute, Inc. is the copyright owner and Licensor.

1.8 “Software Application” means any software applications developed by You to interact with the Work.

1.9 “Work” shall mean the Unified Code For Units Of Measure (“UCUM”), including the UCUM Specification, in any 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).

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

Section 2. License Grant.

Subject to the terms and conditions of this License, each Contributor hereby grants to You a worldwide, non-exclusive, no-charge, royalty-free, revocable license to reproduce, publicly display, publicly perform, and distribute the Work, and to use the Work for the purposes of developing and commercializing Software Applications that will communicate with and interoperate with the Work.

Section 3. License Conditions.

Your exercise of the License Grant is expressly made subject to the following conditions.

  1. You may not:
  2. use the Work for the purpose of developing or promulgating a different standard for identifying units of measure;
  1. use the Work in any way which may dilute the Work’s purpose of providing a definitive standard for identifying precisely defined, unambiguous units of measure in electronic documents and messages;
  2. use the Work in any way that expressly or implicitly change its meaning;
  3. add, delete, or modify the Work’s content including field names, field contents, descriptions, and comments; or
  4. use the Work to create Derivative Works.
  1. Attribution.
  2. If you reproduce or distribute copies of the Work in its entirety, including but not limited to reproduction or distribution in connection with a Software Application, You must:
  1. provide the following with the Work: a. a copyright notice; b. a notice that refers to this License; c. a notice that refers to the disclaimer of warranties; and d. the text of or the URL or hyperlink to, this Copyright Notice and License. ii. You may satisfy the conditions in Section 3(b) in any reasonable manner based on the medium, means, and context in which You exercise the Licensed Rights. For example, it may be reasonable to satisfy the conditions by providing a URL or hyperlink that includes the required information when distributing the Work by electronic download.

Section 4. Grant of Patent License.

Subject to the terms and conditions of this License, 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, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If Your institute patent litigation against any entity (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 any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.

Section 5. Submission of Contributions.

Unless You explicitly state otherwise, 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 you may have executed with Licensor regarding such Contributions.

Section 6. 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 or redistributing the Work as required by Section 3.

Section 7. 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.

Section 8. 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 any Contributor 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 the 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. You are responsible for and liable for all of Your access to and use of the Work, directly or indirectly, whether such access or use is permitted by or in violation of this Agreement. Without limiting the generality of the foregoing, You are responsible for the Software Applications and their use of the Work, if any. You agree to indemnify, defend, and hold harmless all Contributors and their officers, directors, employees, agents, affiliates, successors, and assigns from and against any and all losses, damages, liabilities, deficiencies, claims, actions, judgments, settlements, interest, awards, penalties, fines, costs, or expenses of whatever kind, including attorneys’ fees, arising from or relating to (a) Your use or misuse of the Work, (b) Your breach of this Agreement, and/or (c) the Software Applications. You may not enter into any third-party agreement that would, in any manner whatsoever, constitute an admission of fault by Contributors or bind Contributors in any way, without prior written consent of all affected Contributors.

Section 9. Accepting Warranty or Additional Liability.

While redistributing the Work, You may choose to offer 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 only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.

Section 10. Term and Termination.

10.1 This License applies for the term of the copyrights licensed here. However, if You fail to comply with this License, then Your rights under this License terminate automatically.

10.2 Where Your right to use the Work has terminated under Section 10, it reinstates: a. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or b. upon express reinstatement by the Licensor. For the avoidance of doubt, this Section 10 does not affect any right the Licensor may have to seek remedies for Your violations of this License.

10.3 For the avoidance of doubt, the Licensor may also offer the Work under separate terms or conditions or stop distributing the Work at any time; however, doing so will not terminate this License.

10.4 Sections 1, 7, 10, and 12 survive termination of this License.

Section 11. Other Terms and Conditions.

11.1 The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.

11.2 Any arrangements, understandings, or agreements regarding the Work not stated herein are separate from and independent of the terms and conditions of this License.

Section 12. Interpretation.

12.1 For the avoidance of doubt, this License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Work that could lawfully be made without permission under this License.

12.2 To the extent possible, if any provision of this License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this License without affecting the enforceability of the remaining terms and conditions.

12.3 No term or condition of this License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.

12.4 Nothing in this License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.


APPENDIX: How to apply the UCUM License to your work.

To apply the UCUM License to your work, attach the following boilerplate notice. 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 1999-2024 Regenstrief Institute, Inc. All rights reserved. Licensed under the UCUM License, Version 1.1 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at


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.