This includes the fields Copyright/IP holder, Copyright statement and Creative Commons License. These fields are not required, and can be left blank if you are unsure of the correct values or if you feel that they are inapplicable. The MorphoSource Download Re- Use Agreement and the Additional Usage Agreement are alternative approaches for regulating re-use of media and do not require information to be present in these fields.
...
Importantly, according to our understanding, if the media you share does not legally qualify for copyright for any reason, claiming copyright and specifying a CC license (which itself implicitly claims copyright) may not adequately control reuse of that media (see footnote #1). 2D or 3D images that are created as highly accurate faithful recreations of real-life objects are often not considered copyrightable, at least in the US (e.g., Meshwerks, Inc. v. Toyota Motor Sales U.S.A., 2008). If there is uncertainty about the copyright status of media or whether a media may be copyrightable, the MorphoSource Download Re-use Use Agreement and the Additional Usage Agreement described Agreement described below may be used to specify reuse requirements and restrictions without reference to copyright.
...