It means that PrivMX Team Server software knows nothing about the data it transfers and stores. The content and the structure of information are encrypted by the client software.
Team Servers can do absolutely nothing with the data because they don’t even know the role of each piece of information – it’s all shredded and impossible to recognize or organize. What’s more, even system admins in data centres, with physical access to Team Servers, have no possibility to read and interpret the data.