application feature lock and un-lock

[raybert]

I am working on an application that has different features built in for parsing traffic logs for the television broadcast industry. Marketing wants to sell each feature seperately or as a full package. What would be the best way to turn on and off these features short of having to do seperate builds for each of them. Also if at a later date the customer wants to add features to his existing software without having to send them a new build.:-> raybert