I wrote a JavaScript course that I was contracted by someone on Elance to do for very little ( relative to the amount of time I put into it ), he then sold it to another company, that company then put it on Udemy. For a small amount of time it was at the top of the list of beginner JavaScript courses and had over 10,000 students enrolled. I'm grateful my name wasn't on it as it was my first shot at a full on multi hour long course and there were some problems with it...
but.....
Lesson: If you create courses and sell them to people have stipulations regarding resale.
:/
My story wasn't theft so it's not the same, but I figure it might have some utility to someone on hacker news.