All CIS based checks in the checks folder are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License.
The link to the license terms can be found at
https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode

Any other piece of code is licensed as Apache License 2.0 as specified in each file. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0