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Caliptra Trademark Usage Policy

  • Authors: Hilary Richardson, Dan Scales
  • Reviewed by: Caliptra TAC founding members
  • Last major revision: March 30th 2023

The Caliptra project trademarks and logos (“Caliptra Marks”) are licensed separately from any copyright and patent license grants contained in the Caliptra project GitHub repositories’ applicable open source licenses. Except as provided in this policy and under fair use exceptions, you may not use the Caliptra Marks without permission.

Purpose of the Trademark Usage Policy

This legal policy supplements the Linux Foundation Trademark Usage policy and contains important information. As the steward for the Caliptra silicon root of trust project, the Linux Foundation holds the Caliptra Marks. This Caliptra Trademark Policy exists to protect the work of the Caliptra project and the users of this technology. It ensures that Caliptra users and developers are not harmed through misrepresentation of the Caliptra project.

In order to succeed in the project goals to increase security for users of Caliptra implementations and maintain hard-earned trust, the Caliptra name must be used carefully. Users should know that a Caliptra or Caliptra project-based product using the Caliptra brand equates to quality and security.

Acceptable Use

You may use the Caliptra Marks without prior written permission (subject to the rest of this policy):

  1. To refer to unmodified source code, register-transfer-level, or other files shared in the official CHIPS Alliance Caliptra repositories on GitHub (the “Caliptra Project”);

  2. To refer to the Open Compute Project’s Caliptra specification (the “Specification”);

  3. To refer to the certified, approved chip implementations of the Caliptra design(s) that have received license agreements in accordance with the “technical specifications” section of this policy; and

  4. To explain or disclose that your design or implementation is based on the Caliptra Project, designs, or Specification, if and only if (i) the use of the Caliptra Marks is in accordance with this policy, (ii) the product itself does not describe itself as being “Caliptra,” and (iii) the product adequately disclaims that the implementation is not approved by the Caliptra Project or Caliptra Certified. For example, it is acceptable to say, “This is an unofficial implementation of the Caliptra Specification. It is not Caliptra Certified.” It is not acceptable to say, “This is a Caliptra Root of Trust,” unless it has successfully obtained a Caliptra Certification for that specific implementation.

Logo Usage Guidelines

The Caliptra logo(s) serve as graphic trademarks for the Caliptra Project. Any use of Caliptra logos must be in compliance with this policy and the Linux Foundation Trademark Usage Policy.

Use as a Source Identifier

You may not use the name Caliptra or any close derivatives of Caliptra as the name of a secure silicon product or any related feature or service without prior permission.

Use of the Caliptra name should accurately reference implementations or uses of the Caliptra Project designs and source code in a manner that meets the Caliptra Technical Framework requirements below. You may not use the Caliptra Marks in any other manner that might cause confusion as to the source or affiliation of your product, including but not limited to advertising, websites, social media, or packaging. You may not use the word “Caliptra,” any Caliptra logos or modified Caliptra logos in association with any other product, service, or entity, other than in reference to the Caliptra Specification or Caliptra Project itself.

Technical Specifications & Caliptra Certification

Any person may utilize and implement the designs shared in the Caliptra GitHub repositories, including https://github.com/chipsalliance/Caliptra, according to the license terms in the relevant LICENSE file. However, no implementations or uses may be referred to as “Caliptra” unless such usage is approved for Caliptra Certification and the Linux Foundation grants a Caliptra Certification License.

In order to be eligible for Caliptra Certification, an implementation of the Caliptra designs must meet the standards of the Caliptra Technical Framework (“Technical Framework”) approved by the Caliptra Workgroup Technical Advisory Committee, as described in the Caliptra Workgroup Technical Charter.

Role of the Caliptra TAC

The Caliptra Workgroup Technical Advisory Committee (“TAC”) provides technical leadership for the Caliptra open source project and determines which pull requests may be accepted. The Caliptra Workgroup exists as part of the Linux Foundation’s CHIPS Alliance. The Caliptra TAC, CHIPS Alliance leadership and The Linux Foundation work together on the protection and enforcement of the Caliptra Marks. The Caliptra TAC will set the criteria and determine eligibility for any Caliptra Certification.

Contact Us

We look to our community to help us retain the value of The Linux Foundation’s trade and service marks. If you have questions with respect to these guidelines or to report concerns regarding the use or misuse of a trademark of The Linux Foundation, or to obtain written permission for a proposed use of The Linux Foundation trademarks, contact: trademarks@linuxfoundation.org.