Giving us credit when you use our content and technology is not just important for legal reasons. When you provide attribution to CK-12 Foundation, you support the ability of our non-proﬁt organization to make great educational experiences available to students around the world.
When you copy CK-12 content to any kind of print document, include one of the attributions below.
1. For online distribution:
Google Crawling & Indexing of Content
If you display CK-12 content on your website, we require that you include the following HTML tag on all your website pages that contain CK-12 content, so as to block Google from crawling and indexing CK-12 content displayed on your website:
There are two options on adding the noindex rule to your website pages.
Option A: Add a noindex rule using a meta tag on each page.
To prevent most search engine web crawlers from indexing a page on your site, place the following meta tag into the section of your page:
<meta name="robots" content="noindex">
Option B: Add a noindex rule using an HTTP response header.
HTTP response header
Instead of a meta tag, you can also return an X-Robots-Tag header with a value of either noindex or none in your response. Here’s an example of an HTTP response with an X-Robots-Tag instructing crawlers not to index a page:
HTTP/1.1 200 OK
3. Embedding Content
We encourage you to embed CK-12 assessment content into your HTML web pages by using our embed codes.
Attribution to CK-12 automatically appears on the content. There’s nothing for you to do!