I am certain they try keep most legal activity VERY quiet... You would almost never hear about a cease & desist letters. I don't know anywhere you could search for it.

I don't know where to look for trademark lawsuits and I am not in the mood to search through all the lawsuits that the Ravens have been involved in (I am sure almost all of them have nothing to do with any IP stuff).

But here's a list of Trademark applications that the Ravens have opposed/disputed (if you read it over a number of the oppositions were rejected by the US Trademark office... ie: example 1, example 2). This strongly suggests that in some of the legal filings are of the legal "asshole" nature.

However, the idea that we should rely on billion dollar corporations to be stewards of shared cultural "artifacts" really confuses me... and honestly just exposes how the intellectual property legal world is so deeply misaligned with the way I think things should work.