The CC-BY-SA , section 4 ( c ) , states that : The GFDL , section 4-I , states that : The Wikimedia Foundation 's Terms of Use are clear that attribution will be supplied : If material is used without attribution , it violates the licensing terms under which it has been provided , which in turn violates the Reusers ' rights and obligations clause of Wikipedia 's copyrights policy .
The CC-BY-SA , section 4 ( c ) , states that : The GFDL , section 4-I , states that : The Wikimedia Foundation 's Terms of Use are clear that attribution will be supplied : If material is used without attributing the original authors , then these licensing terms have been broken .