>I heard somebody said, we can get back the source code from a Java executable
>program easily by running some reverse engineering software.

You have to be smart enough to be able to write the thing in the first
place, in order to be able to understand what the decompiler puts out!

>If so, our C programs will be highly
>unprotected, which is something I don't want to see!

It's scarier than that.  Did you know that in some parts of the world
people write programs and then actually give away the source?

;-) Barry

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