Try Das_Registration by Tinman Development
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Easily implement copy protection, serial numbers, network limitations, record limitations, expiration dates, execution limits and file record limitations. Easily adjust each protection scheme by entering a KEY which is unique to each application and customer. This product also features Tinman Development Corporation’s proprietary resource technology to demo-ize your applications.

Clarion 5.5 ; and 5; and 4 experience

I'd looking for this stuff a time ago, and I found several programs that can help. But Two of them get my interest:

1. Is Kenonics Crypkey, wich can protect your software into some stealth an strong protection. There are two flavors, One take your software and wrapp with the protection -I'd have found a Crack in the Web for this protection-. The other one, is including the crypkey's DLLs into your source programs; this last one is more "incrackeable".

About the way the soft is protected, I'd better give ya the address, and take a look!.

http://www.crypkey.com/

2. The Armadillo software protection, is some that I'll try by now, but someone else tell me that is very good.

http://www.siliconrealms.com

Bye.

Thank you very much for your response!  I will check out your suggestion.