"Openleaks is a technology project that is aiming to be a service provider for third parties that want to be able to accept material from anonymous sources," Domscheit-Berg said.

Domscheit-Berg, who during his time with WikiLeaks often went under the pseudonym Daniel Schmitt, said he quit the project after falling out with Assange over what he described as the lack of transparency in the group's decision-making process. "If you preach transparency to everyone else you have to be transparent yourself. You have to fulfill the same standards you expect from others, and I think that's where we've not been heading in the same direction philosophically anymore," he said in the documentary.