Q. Do you have to be connected to the internet to read a Cloud Library borrowed book?

You only need an internet connection to download the CloudLibrary app to your reading device and to initially download the book.  After you've downloaded the book you should be able to read without needing an internet connection.

There is a bit more information and guidelines if you click on Ebooks and Downloadables from the Pasadena Public Library website, under "CloudLibrary."