What is "DP" Primer?

Found a lot of discussions on "DP" primer and "DPLV" primer on the internet, problem is, no one explains what the "DP" stands for. I am guessing "LV" stands for Low Voc. Thank you.

DPLF is the Lead free epoxy version of DP. Some don't like it but I never really had any issues with it other than transparency of the white. It comes in Gray, Green, Gray green, Blue, Red, White, and Black. It has a 72 hour pot life when mixed with DP402LF. If I remember right there is a 30 minute induction time with DP401LF and I would not recommend using it.