It's also worth noting though that there is no need for an AAC license to transmit AAC data. You are only required to purchase a license to use or distribute co

It's also worth noting though that there is no need for an AAC license to transmit AAC data. You are only required to purchase a license to use or distribute codecs, which is a one time fee of about a dollar per codec (AKA per device which can play AAC). I haven't looked into AC-3, but a lot of audio formats would require a per-item costs or related distribution costs for the data as well. That's one of the reasons why MP3 is annoying to deal with commercially, as it has a cost of 2% of revenue for music broadcast/distribution, or a $2,500 cost to bundle MP3s with a single video game title.