The Hadith Collection 1.0

This EBook is 4 Hadith collections in one and contains over 18,000 Hadith from the following:
1) Complete Sahih Bukhari
2) Complete Sahih Muslim
3) Complete Malik's Muwatta
4) Partial Sunan Abu Dawud

Source material for are from the University of Southern California MSA site

Features:
1) Fast search, searching any words or any sentences.
2) Long on click copy and share
3) Big and small text sizes and e.t

Question: Why does it require "write external storage" permissions?

Answer: This is if you want move application to external sd card if your internal storage full.