Demand for these converters is driven by legitimate use cases, including:

Calibre is an open-source eBook management software. When combined with the DeDRM_tools plugin (created by Apprentice Alf), it can sometimes handle VBK files— provided you have the correct keys .

These methods are sanctioned by VitalSource and are the easiest way to extract text for study purposes without technical tools. Export Highlights and Notes VitalSource Workbook

Most VitalSource books allow for a certain percentage of printing (usually 10% to 50% of the book). This is a native feature provided by VitalSource to accommodate students who need physical copies.

For users needing flexibility, these options are lawful:

VitalSource licenses can sometimes expire, or the platform may retire older titles. If you have purchased a textbook for a lifetime license, having a local PDF copy ensures that you will always have access to the material, regardless of internet connectivity or future platform changes.