2c42f43f_se_Versions___Creative_Commons__4_0
[1.0] Copyright notice, author, title, credit noting use of original in adaptation – all may be implemented in any reasonable manner, so long as at least as prominent as other authorship credit if an adaptation or collection [2.0] Copyright notice, author, title, URI, credit noting use of original in adaptation – all may be implemented in any reasonable manner, so long as at least as prominent as other authorship credit if an adaptation or collection [3.0] Author, title, URI, credit noting use of original in adaptation -- all reasonable to medium and means [4.0] 
All reasonable to medium, means, and context
License Versions - Creative Commons
4.0