obfuscate

I have tried many protectors and obfuscators on my projects but havent anyone that works well. I know there isnt any protection that cannot be cracked but there must be some that is hard = requiring alot of time for the cracker, perhaps too much time so they skip trying? Another problem with...

Scenario: You developing a application named "DemoSoft" which is going to be a shareware or Premium, you use different DLL's in this project and some DLL's are owned by you, they are very useful and valuable, you are selling this software and are charging the customer for what the software does...