Webview is not supported fully for Android apps(works for few cases, does not work for some) and not at all supported for IOS apps with VdoCipher due DRM security compatibility issues. Thus it is strongly recommended to go for native apps only.  

Please watch this video to understand an overview of allowing secure downloads in android app and also restricting time duration validity. VdoCipher SDK Link

Overview of key Android SDK Features and Integration parameters Kindly click on "Embed" button below any video in your dashboard, and go to the "Android/iOS app" section to get the documentation and all SDK links (android, ios- native , react-native, flutter). In same module, "Custom Backend" section provides the backend APIs. 2 videos are included below, First is with sample project development through native Android video SDK and 2nd with flutter SDK.