Unfortunately, not all publishers release their titles in eBook form to libraries. MacMillan and Simon & Schuster are the two largest publishers who have refused to sell to libraries. As of November 23, 2011, Penguin stopped selling all their new titles to libraries, and Hatchette Book Group also stopped offering its frontlist titles in mid 2011. HarperCollins now imposes a limit on the number of times their titles may be checked out – 26. However, Random House is one of many other publishers who offer their titles to libraries for purchase without these types of restrictions.