At least the following products are licensed under one or more of the following United States patents:

U.S. Patent No. 10,963,622 (email)

U.S. Patent No. 10,878,172 (email)

U.S. Patent No. 10,810,355 (ebooks)

U.S. Patent No. 10,102,184 (ebooks, mobile device applications)

U.S. Patent No. 9,892,093 (websites)

U.S. Patent No. 9,886,421 (mobile device applications)

U.S. Patent No. 9,405,735 (various)

U.S. Patent No. 8,522,127 (websites)