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Protecting app distributed for DFU

We are using SDK 11 and SD v2. I did a search for an answer to this question, but couldn't find one that addressed it fully but what I gleaned is that this may not be possible with SDK 11, but I thought I had better check.

We don't envisage changing our SD, but we have from time to time updated our app via distribution for DFU. We were having trouble getting the zip file to work, so were just suggesting to users that they select the app.bin and then the .dat file separately and this seemed to work.

But in my paranoia I want to ensure that someone cannot decompile the app.bin or even copy it to another device not provided by ourselves since this may cut across some of our arrangements. Is there a way in which we can protect ourselves here?

Thanks a lot

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