Copyright and credits

Everything on Silkbreath was written, drawn and programmed for Silkbreath. This page explains what that means, what we built on, and how to reach us if you think something here infringes your rights.

Last updated 22 October 2026

Our content

Text: all exercise instructions and course lessons are original writing. They are not copied or adapted from any book, website, video, app or commercial programme.
Figures: the animated figures are drawn by Silkbreath's own software from positions we set ourselves. No photographs, video, motion capture or third-party illustrations are used.
Sound: the bell is generated in your browser. Spoken prompts use your device's own voice.
Design and software: made for Silkbreath.

Exercises and traditions belong to everyone

Physical exercises, yoga postures, Pilates mat exercises, Qigong and Tai Chi movements, and breathing practices are part of a shared human heritage. We describe them and name them in the ordinary way and claim no ownership of them. Traditional names and historical figures are mentioned for education. Short quotations come from works that are in the public domain, in our own translation.

Names and trademarks

Silkbreath does not use, and is not affiliated with or endorsed by, any exercise brand, studio, certified method or equipment maker. Where a word is also someone's trademark, we use it only in its everyday descriptive sense. If you believe we have used a name in a way that suggests a connection that does not exist, tell us and we will correct it.

If you believe a file stored on Silkbreath infringes your rights, use the process below. We act on valid notices, which can include removing the file and closing accounts that infringe repeatedly.

Fonts and open-source software

Spectral, the display typeface, by Production Type, under the SIL Open Font License 1.1.
Atkinson Hyperlegible, the text typeface, by the Braille Institute of America, under the SIL Open Font License 1.1. It was designed to be easier to read for people with low vision.
Ma Shan Zheng, used to draw the two characters of the seal, under the SIL Open Font License 1.1.
supabase-js, the sign-in and sync library, by Supabase, under the MIT Licence.
Kokoro-82M, the open text-to-speech model that recorded the spoken prompts (its voices af_heart and am_michael), by hexgrad, under the Apache License 2.0. The recordings were made from Silkbreath's own words; no real person's voice was recorded or copied.
VieNeu-TTS v3 Turbo, the open text-to-speech model by pnnbao97, with its preset voices, and the MOSS Audio Tokenizer Nano by the OpenMOSS team that turns its output into sound, both under the Apache License 2.0. Together they recorded more of the spoken prompts, from Silkbreath’s own words; the voices are the model’s own presets, whose speakers agreed to their use.
Be Vietnam Pro, the typeface for Vietnamese text, by the Be Vietnam Pro Project Authors, under the SIL Open Font License 1.1.

The full licence texts are published with the site, at fonts/LICENSES.txt and js/vendor/supabase.LICENSE.txt.

Reporting a copyright or trademark concern

If you believe something on Silkbreath infringes your copyright or other rights, email rvfoundry@gmail.com with:

your name and how to reach you;
what work or right you believe is infringed;
the exact page and passage or item on Silkbreath;
a statement that you believe in good faith the use is not authorised by the owner, its agent or the law;
a statement that your notice is accurate and that you are the owner or authorised to act for the owner.

We will review every notice promptly and remove or correct material where the complaint is valid. If your own content was removed and you think that was a mistake, write to the same address.