Hello! There has been very live discussions about this topis at DeveloperMentor DOTNET maillist. See at the following threads... "Protecting assemblies from reverse-engineering" (http://discuss.develop.com/archives/wa.exe?A2=ind0009a&L=dotnet&F=&S=&P=25833) Intellectual Property? http://discuss.develop.com/archives/wa.exe?A2=ind0009d&L=dotnet&F=&S=&P=839 "Legality of ILDASM" http://discuss.develop.com/archives/wa.exe?A2=ind0009e&L=dotnet&F=&S=&P=3783 IL is on more high level than x86 assembler and reverse engineering code from IL is really should be no big deal. There is good decompilers from Java jvm bytecode, so there will be (no doubt) decompilers from IL to C# or to VB.Net, too. One of possible solution is good obsfucator... Or MS will add some kind of encryption... It seems that this is big issue for creators of commercial components or libraries. Slavo

Hello! I second with this. Chris Sells would be very good. Slavo.