CC BY-SA
Provided that the name of the author(s)/rights holder(s) is/are acknowledged, this licence allows the content to be reproduced, distributed, and publicly presented. The content may be modified (including translations of the work), but the modified version must be distributed under the same licence.
This licence is considered to be mostly compliant with open access, as all forms of reuse are permitted, but the publication of a modification is subject to the condition that it is published under the same licence.