Y'know, Ace is the company that "pirated" LotR back in the '60s. (They took advantage of a loophole in copyright law to put out a paperback edition for which they paid no royalties to Tolkien.)
(Yes, this should be split off)
There was no loophole. Mythology notwithstanding, Ace found a 'loophole' which existed only in Wollheim's mind. Although Ace of course eventually settled out of court (an abject surrender, really), others revived its claimed 'loophole' in the 90's and were firmly smacked down by the courts.
Think also, Tolkienistas- how much of The Silmarillion was unwritten because JRRT spent two years dealing with this mess and the consequent revision of his published works?