Have you obfuscated your code? Did you use PreEmptive's Dotfuscator? And if so, did you encounter any issues with things like the reflection and dynamic APIs used by ASPNET Zero? We purchased Dotfuscator Pro and have used it without any problem with a non-ASPNET Zero application and are now about to try it on an ASPNET Zero application. Also, we cannot depend on the customer having internet access on the box the application is installed on so we are using a public key/private key licensing mechanism.