That sounds like "My Math Lab" by Pearson. It is horrible like everyone talking in here states. It's also a bundle with the book sold by unis, because the code

That sounds like "My Math Lab" by Pearson. It is horrible like everyone talking in here states. It's also a bundle with the book sold by unis, because the code 'allows' you to submit homework required for the class. So they're doing both resale prevention, AND horrible grading. People I know who have to interact with it call it "My Meth Lab" - because you have to be high to like it.