8. A transmission method of an image forming apparatus for security transmission of data, the transmission method comprising: extracting text data from data including colors; and transmitting the text data to a management server to obtain transmission permission by determining whether the text data is predetermined protected data that is not to be distributed, and then transmitting the data to a transmission target device according to the transmission permission where the text data is not the predetermined protected data.
8. A transmission method of an image forming apparatus for security transmission of data, the transmission method comprising: extracting text data from data including colors; and transmitting the text data to a management server to obtain transmission permission by determining whether the text data is predetermined protected data that is not to be distributed, and then transmitting the data to a transmission target device according to the transmission permission where the text data is not the predetermined protected data. 9. The transmission method of claim 8 , further comprising: determining whether the data are image mixture data.