Last Updated: February 16, 2021
If you display CK-12 content on your website, we require that you do the following on all pages of your website that contain CK-12 content:
You can use the following HTML code to render the above CK-12 attribution badge:
To make sure internet search engines, like Google, understand that CK-12 is the source of the content, we require that you follow ONE of the options mentioned below:
Block search engines from crawling CK-12 content on your website.
Add the noindex rule on all pages of your website that contain CK-12 content, so as to block search engines from crawling and indexing CK-12 content displayed on your website.
There are two ways for adding the noindex rule to your website pages.
1. 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 head section of your page:
2. Add a noindex rule using an 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:
Add canonical tags pointing to content on the CK-12 website.
For each page on your website that contains CK-12 content, add the HTML canonical link tag in the head section of your website HTML page. The URL in the href attribute of this canonical tag should be the complete absolute URL of that content on the ck12.org website.
As an example, if a page on your website uses content from the CK-12 cell nucleus page, then you are required to add the following HTML canonical link tag in the <head> section of your website page.
You may also choose to set the canonical using the HTTP headers.
Add a link back to the source page on the CK-12 website. As an example, if a page on your website uses content from the CK-12 cell nucleus page, then you are required to add the following HTML link on your page:
When you copy CK-12 content to any kind of print document, include the attribution image shown below.
Right-click to download the image above. Be sure to include the attribution even if you modified the content that was copied.
We encourage you to embed our CK-12 content (in accordance with the CK-12 Curriculum Materials License) 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! Do not remove attribution already included in our embed codes.
You can get the embed codes for our Adaptive Practice, Simulations, and PLIX by visiting these pages and then pulling the code from the individual modality.