Greetings!
If you are aware that the domain has been registered as a trademark before you bought it, then you may have made a stiff move.
Nonetheless, I assume that once you buy a domain name, all rights have been transferred to you. So, in effect, it is just an equivalent of originally registering the domain since 2000.
But, the main question is that who gets the first-use? The domain which was trademarked in 2002 may have been already used before 2000. I mean the business who trademarked it may have been using it in their business before 2000, but has formally trademarked it only in 2002. From what I understand, the one who has the first use has the right to the name. Try to get a background of the business in question. When did they start their business?
An alternative route: a possible domain name sale perhaps? I am not sure if this is the right move though. Anyone can advise on this issue separately.
I wish you well.
