To develop a feature for downloading "InsSBry Out" (likely a reference to by Navessa Allen) in EPUB format, you would need to focus on three core areas: digital rights management (DRM), file format conversion, and legal distribution.

What is an .EPUB file and how do I open and view one? - Adobe

: If the book is protected, your feature must integrate with DRM providers (like Adobe Digital Editions ) to ensure only authorized users can open the file.