There's a very simple answer to this - copyright . Under current copyright law, we can make these materials available electronically only to a limited, specific group - in this case the students of the class in question. The short answer to this is - anywhere you can use a computer that connects to the internet. In fact, since you can also copy these materials to disk - you can access them anywhere you have a computer. You'll need a couple of pieces of software to access these materials.
Versions are available for virtually every operating system and computer.
The nice thing about this method is that you don't have to wait for the software to download. Versions are available for download to work with virtually every operating system and computer type. You will need to contact your professor to get the password for your class.