Creating an Ebook in Word

[beasonfan]

Hi, I am a teacher, and I would like to create a textbook for one of my classes that will include text, pictures, and video. I know how to insert each of these into a Word document, but I am searching for a way to lock some of the content on each page to prevent students from accidentally deleting something. If I wanted to prevent all changes, I could just convert the document into a PDF, but then students would not be able to watch the videos. Does anyone have a suggestion, or is it just impossible to do what I have proposed?