Patent ID: 8239628

Claim:
A document processing device comprising: a first non-volatile memory integral to the document processing device, the document processing device capable of independent physical document output; a detection unit for detecting whether a removable second non-volatile memory, different from the first non-volatile memory, is attached to the document processing device; a document processor, integral to the document processing device, for performing a copy operation requested by a user, the copy operation requiring generation of a plurality of data files including at least one temporary non-secure data file; and a controller integral to the document processing device for: storing the plurality of data files including the at least one temporary non-secure data file in the first non-volatile memory when the removable second non-volatile memory is not attached to the document processing device, storing the plurality of data files including the at least one temporary non-secure data file on the second non-volatile memory when the removable second non-volatile memory is attached to the document processing device and deleting the at least one temporary non-secure data file in the second non-volatile memory upon completion of the copy operation.