If you use ProGuard obfuscator, this prevents the license from working correctly.

Please add following four lines into proguard-rules.pro

-keep class com.abbyy.mobile.ocr4.* { *; }
-keep class com.abbyy.mobile.ocr4.layout.* { *; }
-keepclassmembers class com.abbyy.mobile.ocr4.* { *; }
-keepclassmembers class com.abbyy.mobile.ocr4.layout.* { *; }