If i publish the program with AAC support i must sell my house in order to pay the license, even if the program is free.
The license fee applies to any software implementation that supports that format.
I was contacted by their representative a few months ago and i was kindly asked to pay the license, or to remove the plugin for that format, and this was the logic choice from my point of view.
Remember that rdj it uses un4seen bass, which has their own site with many add-ins...