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What are license terms for using Smack API?

I couldnt find the licensing terms for Smack API. I am planning to use Smack API in my application to push event messages to the users connected to my Wildfire server. I will buy the licenses for Wildfire but what about the licenses for Smack. Do I need to buy it ?

As you can see on http://www.igniterealtime.org/builds/smack/docs/latest/README.html, it uses the Apache license.