Licenses & Attributions for Roll Call

Effective Date: May 26, 2026

Roll Call is developed by John Kenneth Fisher under the Sidelark Labs name.

This page summarizes Roll Call’s source license, project-specific license notice, third-party software, bundled audio assets, and credits.

Roll Call Source License

The public Roll Call source repository is source-available for noncommercial use under the PolyForm Noncommercial License 1.0.0, with additional project-specific terms and asset boundaries described in the Roll Call License Notice.

Commercial use is not permitted under the public source license without separate written permission from John Kenneth Fisher.

Noncommercial use may include personal, educational, nonprofit, public agency, volunteer, youth sports, community sports, research, hobby, and similar noncommercial purposes, subject to the full license terms.

Forks and Modified Builds

Public noncommercial forks and modified builds must follow the requirements in the Roll Call License Notice.

Those requirements include using a distinct app or product name, not presenting the fork as the original Roll Call app, preserving attribution to Roll Call and John Kenneth Fisher, and visibly crediting:

“Derived from Roll Call by John Kenneth Fisher”

Forks and modified builds may describe themselves as derived from Roll Call, but they must use a distinct app or product name.

Commercial Permission

Commercial use is not allowed under the public source license unless separately licensed in writing by John Kenneth Fisher.

Commercial use includes, but is not limited to, selling Roll Call, a fork, or a derivative app; including Roll Call or a derivative in a paid product or service; using Roll Call or a derivative for client work; hosting Roll Call or a derivative as part of a commercial service; or using Roll Call or a derivative internally at a for-profit business.

For commercial permission questions, contact:

johnkfisher@mac.com

Community and Nonprofit Use

Schools, nonprofits, public agencies, volunteer teams, youth sports programs, and community sports organizations may use Roll Call for noncommercial purposes under the public license.

If a use case is unclear, or if commercial restrictions would get in the way of a good community use, please contact Sidelark Labs.

Small Code Snippets

Small, standalone code snippets from the Roll Call repository may be reused commercially.

Attribution is appreciated but not required for those snippets.

This exception does not allow commercial reuse of Roll Call as an app, a fork, a substantial portion of the codebase, the app architecture, UI flows, bundled content, templates, branding, or derivative products.

Reserved Materials

The public software license does not grant reuse rights for all bundled materials.

Reserved materials include:

• The Roll Call app name as a product name

• Roll Call logos, icons, and branding

• John-specific images and personal likeness

• Sample personal or team media

• Any other personal or brand-identifying materials in the repository

Forks and modified builds must replace reserved materials unless John Kenneth Fisher separately permits their use.

Forks may describe themselves as derived from Roll Call, but their app or product name must be distinct.

Third-Party Materials

Third-party materials remain under their own licenses and are not relicensed by Roll Call’s project license.

Fork authors and modified-build authors are responsible for confirming that their use of any third-party material is allowed by the applicable third-party license.

Third-Party Software

Roll Call includes third-party software that remains under its own license.

ZIPFoundation

Version: 0.9.20

Source: https://github.com/weichsel/ZIPFoundation

License: MIT License

Attribution: Copyright/license acknowledgment for Thomas Zoechling and contributors.

Bundled Audio Assets

Roll Call includes bundled general crowd clips from Mixkit.

Provider: Mixkit

License: Mixkit Sound Effects Free License

License page: https://mixkit.co/license/

Sound effects catalog: https://mixkit.co/free-sound-effects/

The reviewed Mixkit sound effects pages state that the sound effects are royalty-free, ready to use, and can be used without attribution.

Bundled clips include:

Small Cheer

Source title: Small group cheer and applause

Victory Roar

Source title: Huge crowd cheering victory

Stadium Burst

Source title: Stadium joy shouting crowd

Rhythmic Clap

Source title: Rhythmic applause and cheering

Whistle Pop

Source title: Male crowd cheering short

Crowd Laugh

Source title: Crowd laugh

Special Thanks

Special thanks to the girls of the Piscataway Thunder Softball Team.

Full License Text and Project Notice

The public Roll Call source repository is licensed under the PolyForm Noncommercial License 1.0.0, together with the project-specific Roll Call License Notice.

The PolyForm Noncommercial License 1.0.0 is available at:

https://polyformproject.org/licenses/noncommercial/1.0.0

The Roll Call License Notice explains project-specific terms, including commercial-use restrictions, requirements for public forks and modified builds, reserved materials, third-party materials, and attribution requirements.

The Roll Call repository includes the full license text, the Roll Call License Notice, and the current attribution record.

Questions

For questions about Roll Call licensing, permissions, or attributions, contact:

johnkfisher@mac.com