This is a viewer for CypherGuard EPUB (https://www.cyphertec.co.jp/services/cypherguard/products/#CypherGuard_EPUB), which protects EPUB files using cryptographic technology.
In addition to regular EPUB files, encrypted EPUB files (.cgepub files) can also be viewed under a license.

*Note
・Even if it is a CypherGuard EPUB content file (.cgepub file), you will not be able to view it if the distribution source does not permit viewing on Android.
・CypherGuard EPUB uses the functions of "Android system WebView" and "Google Chrome" internally. When using the app, please update "Android System WebView" and "Google Chrome" to the latest version.