[doctorwho]

The risk you run by using a third party licensing solution is that they are more attractive targets to crackers. Generally, once a system has been compromised, all of the software using that system become vulnerable. Rolling your own solution takes time and effort and there's no guarantee that it won't be broken but you can also change and update it as needed. In the end you're really only affecting honest customers so keep the system as unobtrusive as possible and put more focus on selling more software and that quality of what you're putting out there - that will more than make up for any shortfalls due to piracy.