Is there anything I can do about this? I don't want to change my business name.

Your question actually has a lot to unpack. As noted, it is likely that you are the senior user as against this one competitor you note, but this...

Need advice regarding copyright law...

How you approach this all greatly depends on the specifics, which we do not have here as well as your own economic interest. Just because you CAN...

Using quotes will generally be permitted. This is largely because using what amounts to a very small portion of a much larger body of work will not...

Can I use video game music, from the game itself?

No, very likely not. The simple reason is that your use of the music is collateral or ancillary to your use of the actual footage for expository...

Do I have a case for infringement against this artist?

As you can probably tell, any IP lawyer would have to flesh out all the particular details to determine if there is any merit to your case. I...

Is a unique hashtag tagline able to be trademarked?

If you plan on using this tagline in commerce as a source identifier for your goods or services (e.g., "Just Do It" or "I'm Lovin It") then you...

What, what can be done if anything?

Copyright law like patent law follows the "separate-accrual rule." The statute of limitations is three years, but this rule means that each...

How i can save my copyright of my trade market in California

I'm not sure what you mean exactly, but I see my colleague offered a very good response. Any creative expression will be covered by copyright...

Are there any potential legal ramifications for me starting my publication using the same name?

As noted, you just cannot receive any trademark clearance advice here. Just because a registration expires or was never applied for does NOT mean...

Can I use old logo free fabric and turn them into bowties and sell them on etsy?

From a copyright perspective even if the fabric possessed copyright protected elements the first sale doctrine should protect you from subsequent...