I would like to know which forum software is using by DP and which is better one..Whether the DP is customized one?
DP is using vBulliten. I personally prefer phpBB starting from the fact that it's totally free and open-source while you have to pay for vBulliten license.
There's only one thing that could make someone choose vBulliten over phpBB which is,with phpBB it is recommended to have at least basic understanding in PHP and HTML in order to customize your board more. Though,it's getting easier with every release since phpBB team created AutoMOD it became very easy to install modifications. So yea,unlike vBulliten in phpBB you'll have to look around and do things yourself more often than just clicking the install button.
DP is using vbulletin and this is not customized its a cms. and vb is the best in my opinion if u cant pay for that there are lot of ways to get crack one first use crack one if u like that then go for the premium one