I lean towards "prominent on front" and not copyright line. Otherwise we end up with "1970 Xograph Kellogg's", "1975 Marden-Kane and Rosenfeld, Sirowitz, & Lawson McDonald's Quaterbacks". And if we allow copyright line to influence set names we would HAVE to change to "Fleer Ultra", "Topps Stadium Club", "Upper Deck SP", "Panini Donruss", "Panini Leaf".
Then you have these, 1992-93 Upper Deck McDonald's or 1991-92 Fleer Tony's Pizza. Neither has the names (or logos) McDonald's or Tony's Pizza printed anywhere on the card.
Someday my cards may double in value and then be worth half of what I paid for them.