A Creative Commons Licence that lets others remix, adapt, and build upon your work even for commercial purposes, as long as they credit the author and license their new creations under the identical terms. This license is often compared to “copyleft” free and open source software licenses. All new works based on the source will carry the same license, so any derivatives will also allow commercial use. For example, this is the license used by Wikipedia.

Source: Creative Commons

First letter