DPML stands for the Domains Protected Marks List. Brand owners can add their trademark-related terms into the DPML and have them blocked from registration at the second level in all Donuts-top-level domains (Donuts TLDs). DPML protects trademarks holders against cybersquatting at a fraction of what it would cost to defensively register the terms in Donuts TLDs.
Donuts is the largest registry operator for new gTLDs. They manage over 238 new cpr144449003101 TLDs currently and are expected to add more that can be blocked with the DPML.