Licenses allow you access to the e-Book for a limited time
Depending on the choice you make, you will have access to the e-book for that amount of time from the date of purchase.
Should you require the book for a longer period, you will be able to purchase additional licenses which will be added
to your current license, and will extend the time frame you have to view the book.
No matter your device you will be able to access your book anytime anywhere. Online or offline.