Halved’s mathematics teaching material is built on published material from the Department for Education, and the Halved product includes software and a font made by others. This page names that material and those components, says who made them, and states the licence Halved uses each under. It is a list of sources and notices, and nothing on it is a statement about what Halved teaches.
Curriculum sources
| Source | Publisher | Licence | What Halved uses from it |
|---|---|---|---|
| Teaching mathematics in primary schools, which contains Mathematics guidance: key stages 1 and 2 | Department for Education, 2020 | Crown copyright, Open Government Licence | The mathematics method statements it sets out, keyed to the ready-to-progress criteria it defines. |
| Teaching mathematics at key stage 3 | Department for Education, September 2021, developed with the National Centre for Excellence in the Teaching of Mathematics (NCETM) | Crown copyright, Open Government Licence | The core concepts it sets out, with the teaching guidance and the common difficulties recorded against each. |
| The national curriculum in England: primary and secondary programmes of study | Department for Education, 2013 and 2014 | Crown copyright, Open Government Licence | The year group and key stage structure of the programmes of study, and the statutory word lists published with them. |
Curriculum licence
Contains public sector information licensed under the Open Government Licence v3.0.
Halved uses the text of these documents. It does not use their illustrations or diagrams. The key stage 3 guidance names its NCETM illustrations, a Gapminder graph and extracts from Standards and Testing Agency past papers as third-party material excluded from the Open Government Licence; Halved holds none of that material.
Software and fonts used in the Halved product
This section is separate from the curriculum sources above. These components are part of the Halved product, not of its teaching material, and the Open Government Licence does not apply to them.
| Component | Made by | Licence | What Halved uses it for |
|---|---|---|---|
| OpenDyslexic, regular and bold | Abbie Gonzalez | SIL Open Font License, Version 1.1 | A font a student can choose for reading the chat and lesson notes. |
Tiptap 3.31.4: @tiptap/core, @tiptap/react, @tiptap/pm and the @tiptap extensions Halved uses | Tiptap GmbH | MIT License | The text editors in which lessons, feedback, answers and shared material are written. |
OpenDyslexic
The copyright notice, as it is shipped with the font files:
Copyright (c) 2019-07-29, Abbie Gonzalez (https://abbiecod.es|support@abbiecod.es),
with Reserved Font Name OpenDyslexic.
Copyright (c) 12/2012 - 2019
This Font Software is licensed under the SIL Open Font License, Version 1.1.The licence text is published at openfontlicense.org, which is where the address given in the notice, scripts.sil.org/OFL, now leads. The licence asks that the copyright notice and the licence travel with every copy of the font: Halved serves the font files unmodified, with the full licence text beside them as OFL.txt, and does not sell them. This page repeats the notice as an attribution.
Tiptap
The copyright notice and permission notice, as they are shipped in each Tiptap package:
MIT License
Copyright (c) 2025, Tiptap GmbH
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.This page is an attribution, and it gives the copyright line and the permission notice in full rather than a link to them.
Review
This page is reviewed at least once a year, and whenever material, software or a font is added to or removed from the lists above. The next scheduled review is September 2027.