Software licensing

In this post I would like to briefly describe the topic of software licensing and present few solutions I found on the internet. Licensing topic is highly connected with application security and piracyproof so to speak. We generally provide licensing mechanism when we want to assure that nobody who did not paid for the application can not access this application. We want to protect our intellectual property and give the access to the application only those people who paid us for that.

How this all looks in practice ?