Yes and No.
Yuzu Web Reader:
Yes - For our Web Reader customers, your digital library is stored online and your computer will need to have a live internet connection to access and read your eTextbook. Using the browser-based application the digital content is not downloaded to your computer. Your annotations are automatically synced as you turn the pages.
Yuzu for Mobile (iOS and Android):
Yes and No - For our iOS and Android app customers, you will need internet access to sign in and download your eBooks to your device. Once downloaded you will not need to be online to read or annotate (notes & highlights) your digital content. We do recommend regularly accessing the Yuzu App when online to sync your Highlights and Notes. They are stored on your device until you sync.