Nothing. In Germany the book rights are owned by the government of Bavaria and they have refused to print or sell any copies. However, the German copywrite runs out next year and the book goes into the public domain. So in 2016 any publisher can print it, sell it, and keep all the profits.
That's what the U.S. publisher did. Houghton Mifflin had the rights to the book before World War 2. But there was a legal wrangle with two other publishers who released versions, and by the time that was sorted out in the courts the war had started and all financial dealings with Germany were frozen. Legal rights to the book were then the property of the U.S. government and between 1939 and 1979 the government made about $160,000 in royalties, all of which were turned over to the War Claims Fund which paid damages to, among other people, U.S. POWs. In 1979 Houghton Mifflin bought the rights back from the government and then could sell the book and keep everything. Their profits by 2000 could have been as high as $750,000 but in that year U.S. News and World Report wrote a story on how much Houghton Mifflin had made and the publisher said they were donating all past and future profits from the book to charity.
I don’t know why anyone would want to even buy the book.
Even if you were curious about it, you could sign it out of the library. Nearly every library carries it.
Although I have never read it, by all accounts it is rather dull tract and not worth the time it would take to get through it. Although Hitler had a charismatic speaking style, his book is extremely dull and boring in comparison.