OPEN SOURCE

Open-Source E-Paper Firmware and Licensing

ZECTRIX publishes working reference code and developer documentation for NOTE4 e-paper hardware. Each repository or release states what can be used, modified, and redistributed; product and brand assets remain outside that scope unless expressly licensed.

Updated August 19, 2026

1. Published open-source scope

NOTE4 Devkit: the MIT-licensed black-and-white e-paper demo provides full and partial 1-bit refresh plus full-screen 4bpp, 16-level grayscale on ESP32-S3 hardware.

NOTE4C Devkit: its reference development path covers Wi-Fi provisioning, image transfer, and basic four-color display validation. Only files and materials explicitly published with an open-source license are included.

Other software, hardware materials, or documentation are open source only when the relevant repository, release, file header, LICENSE, or NOTICE explicitly says so.

2. The project license takes precedence

Before using, modifying, copying, or distributing open-source content, review the LICENSE and NOTICE files, source file headers, release page, and third-party dependency notices for the relevant project. If this page conflicts with a specific project license, that project license controls.

3. Open source does not mean every asset is free to use

Unless a license expressly includes them, open-source permissions generally do not cover:

  • The ZECTRIX name, logos, or other trademark rights.
  • Product renders, commercial photography, website design, or promotional content.
  • Customer comments, customer images, or third-party platform content.
  • Unpublished production files, server systems, keys, or credentials.

To use brand assets in a commercial product or discuss a joint project, contact us through our Business page.

4. Contributions, issues, and security

You are welcome to report an issue through the relevant project's issue tracker, discussion area, or documentation channel. Do not publicly disclose security vulnerabilities, credentials, personal information, or other high-risk issues that have not been made public. Instead, email info@zectrix.com.

5. Developer resources

Open NOTE4 Reference Code

For the black-and-white development path, see the GitHub repository, v1.0.0 reference release, MIT license, and NOTE4 Devkit page.

For four-color hardware, visit the NOTE4C Devkit page. The ZECTRIX Wiki and Support page collect the current documentation and development links.