So here's the actual document, signed by Karmanos:
http://assignments.uspto.gov/assignments/assignment-tm-6407-0549.pdf
Quote: "For good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, Assignor hereby conveys, transfers and assigns to Assignee and its successors and assigns, and Assignee hereby accepts, all right, title and interest in and to the Marks, together with the goodwill of the business associated with them. Assignor further assignee, and Assignee hereby accepts, (i) all rights to collect income, royalties and damages due to accessor with respect to the Marks and to sue for and receive and collect all damages occurring from past or future infringements or misappropriations of the Marks; (ii) all rights to apply for additional registrations for the Marks and any other rights corresponding thereto anywhere in the world, with full benefit of priority therein as may now or hereafter be granted by law, treaty, or other international convention; and (iii) all rights, interest, claims and demands recoverable in law or equity that Assignor has or may have in profits and damages for past, present, and future infringements of the marks, including, without limitation, the right to compromise, sue for and collect such profits and damages; the same to be held and enjoyed by Assignee, its successors and assigns or their legal representatives, as fully and entirely as the same would have been held and enjoyed by Assignor if this Assignment had not been made."
Reads to me like the NHL has a whole infrastructure for dealing with this stuff, and the club turned the rights over to the NHL and their marketing+lawsuit machine for "good and valuable consideration", i.e. a big cut of the profits.
Note, though, that this particular assignment is *only* the Whale Tail, as far as I can tell, which is the only mark enumerated in Schedule A; the wordmark is still a separate copyright.