The MIT licence, in plain words

Every public specification on Open Speckit is published under the MIT licence - one of the simplest and most permissive open-source licences.

For consumers: you can use, copy, modify, merge, publish and sell work based on any public specification, in commercial projects too. The only condition is keeping the licence notice with the copied content.

For authors: you keep your copyright. You grant everyone a broad, irrevocable permission to use the content. You cannot revoke it for versions already published, but you can stop publishing new versions or unpublish old ones from listings.

Forks: a fork keeps an attribution block pointing at the source specification and version. That is good practice - and the licence notice requirement in action.

Full licence text

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.