To protect malicious applications from accessing a content provider, 1 way 
is to set the  android:protectionLevel="signature".

This way, only another app that has been signed with the same signature 
could access the contents of a content provider.

But is it safe? How does it check the signature? For example I have a 
signed App A, is the signature stored somewhere for another app to check?

Or the checking is done by another mechanism?

Thanks in Advance

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