Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)

This license is the same as the CC-BY 4.0 but it adds a requirement of sharing the work and its derivatives under the same license. This is a reciprocal, _copyleft_, license that keeps culture free. Though commercial uses are allowed, they must be shared under the same license, so any modifications done for profit are free as well.

You are free to:

Share -- copy and redistribute the material in any medium or format

Adapt -- remix, transform, and build upon the material for any purpose, even commercially.

The licensor cannot revoke these freedoms as long as you follow the license terms.

Under the following terms:

Attribution -- You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

ShareAlike -- If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

No additional restrictions -- You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Notices:

You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.

No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.