Can the user print your ebook? A good encrypter allows you to disable the browser print dialog via CSS/JS overrides.
Most tools require a contents.html or .toc file listing: HTML Ebook Maker and Encrypter
The "Maker" component of the software is the engine of creation. It transforms raw content—typically a collection of HTML files, images, and media—into a cohesive, distributable product. Can the user print your ebook