Hi,

I've just completed my first major application, and I've got some people interested in buying it (or should I say interested in paying for the rights to use it).

What I'm curious about is the best method to set it up so that these paying users will be authenticated. Should I set it up to require a serial number or some similar method? If so, how do I implement it? Are there other options?

Currently, I have a quick fix in place that allows use for a set period of time (ie: 30 days) after which the app just won't run, but this is hardly a permanent solution.

I'd welcome anyone's suggestions on the subject.

Thanks.