Now we updated our EPUB SDK repository, the last version called EPUB UI Component.
EPUB SDK (the last version called EPUB UI Component) is a free software, all rights reserved by An Fengde Information Technology Co.,Ltd.
You can use EPUB SDK to make your own application. It’s free.
The only requirement is that when you distribute your program you have to indicate the source of EPUB SDK (putting a link in your documentation is fine).