I am trying to consider whether to get a DBA on my business. I understand that this does not prevent someone else from using the business name, for which I would have to register the name and/or trademark. After learning a little bit, I begin to think that getting the DBA may be much more important than the trademark though. I still would appreciate the security of knowing someone else can't use or come up with something too similar to my name, though. Is it necessary to get both of these things done or does one or the other do multiple "jobs?" I would even consider an LLC if it would cover some of these other issues as well. I am a sole proprietorship. Thanks for any advice.