Copyrights

Who owns a company's ticker symbol and can they prohibit its use?
If a company has a ticker symbol - lets say XY - who actually owns this ticker symbol. Is it the exchange or the company? The reason I am asking this is to determine if a company who has the ticker can reasonably prohibit another company from issuing press releases using that ticker. It’s not prohibited in our contracts - so I am wondering if they even can.
What differentiates a new computer program from a revised one?
What constitutes a new computer program versus a revised one?
How can I sue someone for unauthorized use of my photos?
How do I sue someone for unauthorized usage of my photos on their website for over 6 months. I live in Los Angeles (where we took photos, which he chose not to buy after the shoot) and he lives in London?
What are the requirements for registering the service mark 'Planetary Psychology'?
I wish to register a service mark. I am using the words 'Planetary Psychology' as a service mark. I am trying to understand the requirements that it cannot be 'merely descriptive.' I did have these words as a service mark in California but it expired. I have to re-register, but now I am wondering if these words fall under 'merely descriptive' and will not be service marked. What would be an example of a servicemark that is not descriptive?
How can I protect my book ideas and work?
How do you write a book and protect your ideas and work?