In English, these two are different concepts:

> 
> You don't have to read the book.
> 
> 
> You must not read the book.
> 
> 
> 

But in German, I believe the same sentence would work for either one.

> 
> Du musst das Buch nicht lesen.
> 
> 
> 

Reading this sentence in isolation, I would suppose it meant "You don't have to read the book." Is there a way to force an interpretation of "You must not read the book."? Would you have to use dürfen for that? Maybe like:

> 
> Du darfst das Buch nicht lesen.
> 
> 
>