CC license
CC BY -> need to credit the author
CC BY-SA -> need to put exactly the same license on derived products
CC BY-NC -> non-commercial use forbidden (scientific publishing has a commercial use, publisher sells it)
CC BY-NC-SA -> non-commercial use forbidden + same license on derived products required
CC BY-ND -> remixing or transforming forbidden
CC BY-NC-ND -> non-commercial use forbidden + remixing or transforming forbidden