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All commercial protection mechanisms use encryption to protect the important parts of a apps code.
You'll need to "unwrap" the app, rebuild it so that it will run "as is", then disassemble it to remove cd checks.
This ain't easy. There are public release unwrappers (safedisc1=many progs, safedisc2= R!SC's unsafedisc app, securom=many generic unwrappers, securom2=nothing publicly released).
You'll find them if you do a google search.
Once unwrapped, you'll have to rebuild the import table using e.g. revirgin/imprec.
As you can see it isn't easy, and if I've lost you already, then I'd recommend you search for tutorials and do lots of reading.
Oh, and you'll need progs like SoftICE, Icedump, Icepatch, Iceload, FROGSice, Procdump32 etc etc etc............
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