Display device and control method therefor

A computer program product comprising:

• a first memory configured to store a plurality of instructions;
• and
• a processor,
• wherein the instruction is executed by the processor to store data of a first operating system (OS), a second OS and a third OS in a first area, a second area and a third area of a second memory, respectively, and restrict access of the first OS to the data stored in the second area and access of the first OS and the second OS to the data stored in the third area, and
• authenticate the content based on the received authentication information based on execution of the third OS, and control the content to be processed, by receiving content from an external apparatus based on execution of the first OS, and receiving authentication information of the content the external apparatus based on execution of the second OS.

A method of controlling a display apparatus, comprising:

• storing data of a first operating system (OS), a second OS and a third OS in a first area, a second area and a third area of a memory, respectively;
• restricting access of the first OS to the data stored in the second area and access of the first OS and the second OS to the data stored in the third area;
• receiving content from an external apparatus based on execution of the first OS, and receiving authentication information of the content based on execution of the second OS;
• and
• authenticating the content based on the received authentication information based on execution of the third OS, and controlling the content to be processed.