CdwJava
Senior Member
Some ebooks have exercises, quizzes, and other add-ons associated with them and these would vary by edition - often changing every year or two. In my experience both as a grad student and instructor was that while it was possible to order the ebook through the student bookstore, as long as you had the correct edition you were free to purchase it legally through another reseller. But, if you got the WRONG edition, you were out of luck.