Course keys for most Cengage products can be registered here. Those products have course keys which are a 12 or 15-digit string of numbers and letters. There are a few specific types of course keys that cannot be registered here. To register
is Cengage's library reference arm and specializes in e-research and educational publishing for libraries, schools and businesses. The company creates and maintains databases that are published online, in print, as e-books and in microform.