This.

“In a statement to The Banner, the Ravens said that "the intent of this trademark filing is not to prevent anyone from the general use of 'Charm City.' We understand that 'Charm City' is a commonly utilized moniker by many entities, and we fully respect that."

"Our trademark filing is specific to anything in connection with, or relating to, Baltimore Ravens professional football. This includes team marketing campaigns — such as 'Charm City Football,' which is used to represent the history of football in Baltimore — slogans, merchandise and promotional items," the team added.”

The team is only attempting to protect Charm City when it’s used in connection to Baltimore Ravens Football. This is a preventative measure because allegedly some person in the past trademarked a slogan that the team was using before they could and then tried to force the team to buy it from them.