No, you cannot use CK-12 content to make money. CK-12 provides its educational resources free of charge, they are intended to support teaching and learning; not to be resold or used for commercial purposes without permission.
The ability to use CK-12 content depends on the license associated with the specific resource.
Personal and Educational Use
You may use CK-12 content for non-commercial educational purposes, including:
- Classroom instruction
- Homework and assignments
- Student learning
- Homeschool education
- Tutoring (when using CK-12 as a teaching resource, not reselling the content)
- Personal study
Commercial Use
You may not:
- Sell CK-12 textbooks, lessons, or other content.
- Republish CK-12 content as part of a product or service you sell.
- Charge others for access to CK-12 content.
- Remove copyright notices or claim CK-12 content as your own.
- Use CK-12 content in a way that violates its material license or CK-12's Terms of Use.
If you're unsure whether your intended use is permitted or would like to request permission, please contact customer support (support@ck12.org).