How does the licensing system work?
The application of a copyright license on a work (a careable documentation) is possible as a subsequent phase followed by the initial acquisition of copyright protection. In other words, the author (the licensor/a person who drafted the careable documentation) first automatically obtains the copyright for his/her work and then he/she decides on how to regulate his/her exclusive rights by applying a license on such work (the licensed work/the careable documentation) whose effects are spread on variety of indeterminate subjects (the licensees/however wants to use/replicate/etc. the careable).
Before applying a license, which will last for the full duration of the applicable copyright protection, you have to think (1) if the material is copyrightable, (2) do you own the material you wish to license, and (3) do you know that Creative Commons licenses are not revocable (however, you can still stop offering material under a Creative Commons license at any time but it is not retrospectively applicable on the rights associated with any copies of your work).
To help yourself choosing a license, you may try this tool: https://creativecommons.org/choose/.
About Creative Commons licenses
There are 6 Creative Common licenses, listed from the most permissive to the most restrictive:
This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials. For further information, see https://creativecommons.org/licenses/by/4.0/.
- Attribution-Share Alike
This license lets others remix, tweak, and build upon your work even for commercial purposes, as long as they credit you and license their new creations under the identical terms. All new works based on yours will carry the same license, so any derivatives will also allow commercial use. For further information, see https://creativecommons.org/licenses/by-sa/4.0/.
- Attribution-No Derivatives
This license allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to you. For further information, see https://creativecommons.org/licenses/by-nd/4.0/.
- Attribution-Non Commercial
This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don’t have to license their derivative works on the same terms. For further information, see https://creativecommons.org/licenses/by-nc/4.0/.
- Attribution-Non Commercial-Share Alike
This license lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms. For further information, see https://creativecommons.org/licenses/by-nc-sa/4.0/.
- Attribution-Non Commercial-No Derivatives
This license is only allowing others to download your work and share it with others as long as they credit you, but they can’t change it in any way or use it commercially. For further information, see https://creativecommons.org/licenses/by-nc-nd/4.0/.