The publisher recently lost its licence to release new material featuring various pulp heroes including The Spirit, but may continue collecting past stories about the Will Eisner creation.
Denis Kitchen, an agent for the Eisner estate, told The Beat that DC will hold the rights to reprint existing material for "the foreseeable future" but hinted this could change.
"There is a contractual formula I can't divulge under which the rights would revert. When that might apply is impossible to predict at the moment," he said.
"I would say watch for a press release in the not-too-distant future which might provide a clue."
Dynamite Entertainment has dominated the pulp comics market in recent years with titles including The Shadow, The Spider, Masks and Thun'da.
DC included the lost characters in its short-lived 'First Wave' line - which centred around a retro world and also featured an alternate version of Batman - from 2010 to 2011, before its abrupt cancellation.