resource are insecure inside apk :(

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Java

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Android

encryption

Hi All,
I have few elementry sound files[1mb+ size] in res\raw , I am reading 2 at a time and mixing it as a conposite sound and sending it to audioTrack to play.

[before when I didn't got the idea of encrypting I used to read it as inputstream and process it then and there then release memory and then taking the next chunk]

Now when I know it is not secure ,I want to secure those elementry sounds.

the procedure I tried:
style 1>
encrypt the sound and pack in apk file and host in google.
decrypt the sound file at runtime and mix and play.

problem: It is crashing as I am reading the full 1mb in memory and decrypting in memory
and playing.

style 2>
decrypting and storing in cache or temporary file [taking space from external memory]

problem:If the person don't have sd card.
if they root it and copy the decrypted sound from temp folder.


style 3,4,5,.... Here I need helps :(

thanks in advance