Unfortunately RIM don't offer much in the way of licensing services for App World Applications. The various options are listed in their FAQ
There are basically 4 options for licensing of App World Apps:
- Static - no license check performed
- Single - one license key unlocks every copy of your application
- Pool - you provide a list of keys any one of which unlocks the application
- Dynamic - App World invokes a web service to generate a unique key for each user.
RIM left implementing Dynamic licensing (the only one that makes sense if you have any concerns about piracy) and implementing support for trials as an exercise for the app developer.
This same topic came up over on the RIM forums & due to demand from other developers we've decided to offer dynamic licensing services to other developers. We had to implement this for my applications so why not offer the service to others for a nominal charge.
You can find more information about our licensing services on our site.