Preparing to go to the Thai Embassy here in Hanoi to get a tourist visa for Thailand. Looking over the needed documents, can anyone clarify what the mean by "a certified true copy", as in this statement? And if it means I have to have some type of certification done, anyone know who, or where I can have this done?

"All personal documents (e.g., copy of identity card, passport, work permit, Thai house registration, etc.) shall be certified true copy, signed and dated by the owner of the documents."