Green in Sherpa: author can archive pre-print (ie pre-refereeing), author can archive post-print (ie final draft post-refereeing), author cannot archive publisher's version/PDF. 6.6.12-MMM 
Metadata revised, LL 6/5/2020. --
Metadata revised & Official URL corrected. Unsigned . -- 
Generic Permission Form added to Dark Archive, Author Submission & Permission Form was sent never came back as a signed document, 19.10.2020-MMM