It's better than running into "legal issues" whenever you use it.
If you really want to use it, ignore them. All the legal right belong to Badspot.
You just called yourself stupid by stating that RP Core have used Sassy. It never has, and never will use Sassy.
And if you couldn't use RP Content to your RP, then I ask you what was the problem?
I'm pretty sure the early version used a slightly modified sassy.
I forgot what the problem was, it was a few months ago.