Macmillan, the last remaining publisher holdout in the Department of Justice’s e-book pricing antitrust lawsuit against five publishers and Apple, has decided to settle about ten months after the lawsuit was originally filed. CEO John Sargent had said in late December that the company wouldn’t do so, but acknowledged Friday in a letter to authors and agents that “the potential penalties became too high to risk even the possibility of an unfavorable outcome.” The settlement means that Apple is the only remaining party fighting the DOJ lawsuit.

According to documents filed with the court Friday (PDF), Macmillan agreed to many of the same settlement terms that HarperCollins, Simon & Schuster, Hachette and Penguin already agreed to — but there are also significant differences. Retailers will immediately be allowed to discount Macmillan’s e-books, in order to “provide for more prompt relief to consumers.” In the cases of the three original settling publishers (HarperCollins, Simon & Schuster and Hachette) and Penguin (which settled in December), “several months passed before consumers saw the benefits of the settlements through lower retail prices on many of the settling publishers’ e-books.” In Macmillan’s proposed settlement, however:

Macmillan must allow its e-book retailers to discount within three business days of agreeing to the settlement, even if it has not formalized new contracts with retailers…To induce Macmillan to accept this more stringent term, the United States agreed that the two-year cooling-off period for Macmillan would run from December 18, 2012, the date on which Penguin signed its settlement.

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That “two-year cooling-off period” means that, for two years, settling publishers can’t restrict retailers like Amazon from setting, changing, or lowering e-book prices. The settlement means Macmillan gets a back-dated head start on this period, so it will again be able to restrict discounting in December 2014.

Most-favored nations clauses are prohibited for five years, but Macmillanhad already removed those from its contracts.

Unlike the other big-six publishers, Macmillan also publishes digital textbooks. Those are exempt from the settlement because the DOJ antitrust case focused only on trade books.

“Our company is not large enough to risk a worst case judgment”

In his letter, Sargent describes massive legal bills that Macmillan — the smallest of the big-six publishers, and the only one that is entirely privately owned — would have had to pay in “a worst case judgment”:

As each publisher settled, the remaining defendants became responsible not only for their own treble damages, but also possibly for the treble damages of the settling publishers (minus what they settled for).  A few weeks ago I got an estimate of the maximum possible damage figure. I cannot share the breathtaking amount with you, but it was much more than the entire equity of our company.