The book is not a composite/collective work such that Stephen King's copyright notice applies to the cover.
Furthermore, even if a copyright notice inside the book applies to the cover art, King is not the name of the proprietor of the cover nor a name by which the proprietor is generally known. King is neither an assignee of the cover nor a licensee such that his copyright notice shields the proprietor from forfeiture. Thus the cover art is published without a copyright notice and is hence in the public domain.
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