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Recently I released an app into Android Market using the licensing system with the ServerManagedPolicy model.
Some days ago someone cracked the apk making it always response “Using cached license response” and allow access.
How can I avoid that in future apps? Thanks!
I agree with @Tom van der Woerdt Implement your own licensing library
I’d also refer you to check out this from Google I/O 2011:
Evading Pirates and Stopping Vampires
http://www.youtube.com/watch?v=TnSNCXR9fbY
EDIT:
The Presentation Notes from Evading Pirates and Stopping Vampires
Some basic keypoints