Say a buyer purchases one of your tracks for the minimum “Music Standard License”.
After purchasing, the buyer then sends the track to their own producer, who adds their own vocals, makes a few changes to the song like arrangement, add a few new FX, whooshes etc.
The song is then later used for Music & Broadcast, and is placed on a Television commercial without having paid the proper full license.
The buyer claims that it is fair use because they “modified” the track to make it 30% different.
You (the author) of the song are upset and demand that the purchaser buys the Music & Broadcast license to make it fair.
Who is in the right?