About an App which uses this project but not open souce.

May 17, 2015 at 12:46 AM
Edited May 17, 2015 at 12:50 AM
While, I think I found an App in Windows Phone Store which seems to use this open source project, but I can't find any information about the App's source code in the app itself or on it's introduction page.
Here's the app's store link:
《读书》(ReadBooks)
The author doesn't comply with GPLv2?