Securing my app & obfuscation ...

[illskills]

ok so i've spent the last five years of my free time developing an application I believe I almost have ready for deployment.

I have added code to enable a 30 day demo. (all export functions are disabled)

The code encrypts a date to the registry.

This is then decoded and checked by the software on load.


If they back date the computer to extend the demo beyond 30 days it will quit.
If the date expires it quits the user / and asks for a reg key.

The key is generated from the machines ID code.

and stored in the reg encrypted when the app is registered.

My question is this ... do i need to include any extra security checks ... is this the best way of securing my software.

and ... obfuscation ... should i obfuscate my code.

and can someone point me to a good freeware obfuscator b/c i've looked throught the first 30 pages of google results all the ones i can find are demo versions and will not let me obfuscate the code and most are really expensive.

thanks for your help in advance
John

i have also searched these forums but most links to obfuscators / security tutorials