As far as I know, Don Rosa is a pedigree. =) Though, I'm not sure the definitive opinion has been set down on that.
Don Rosa is considered a collection.
No, its a pedigree. It is called the DR Collection, as that is its name, but it has is a ped recognized by cgc.
Don't see how the Don Rosa can be considered a pedigree, since many (most?) of the books from before 1966 were purchased secondhand. I mean, Calvin Slobodian trims like two books and buys like three more secondhand, and his complete run of ultrahigh grade books from 1961 on (including perhaps the finest run of pre-1963 Fantastic Fours) gets nary a mention by CGC.