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The AV transformation is an interface into the software library which is being used in the background.
Regarding licensing - if you have the UnlockCodes for the reference data, you can use those in DQ or directly with the software library.
Depending on your circumstances it might be faster, when you provide your own implementation of the software library (either as a web service or a standalone binary).
However, you will loose all the "garnish" provided by DQ around the AV transformation such as graphical configuration interface, mapplets to "decode" the response codes etc.