I tried some quick test on my Nexus 7 : 
*adb install foo.apk*

Look at the space used on the device: 250 KB
*adb install -r -l foo.apk*

Look at the space used on the device: more than 2MB

So I thought that the first app using forward lock would cause this "extra" 
space to be used.. but no. If you have 2 apps, each will be more than 2MB.

The question is what is the purpose of those 2MB ? Why use 2MB for a 200KB 
app?? I can't imagine a factor 10 in size is needed to encrypt anything.

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