A video relayer device includes a processing unit and a memory. The processing unit includes: a key information transfer section to transfer first key information to a video content sink upon receiving the first key information from a video content source having a timer, and a timer pausing section to control the timer of the sink to pause upon receiving the first key information from the source. The processing unit is operable to receive second key information and a calculation result from the sink and store the same, respectively in the memory. The processing unit further includes a timer resuming section to control the timer of the source to resume when the second key information and the calculation result have been stored, respectively, in the memory.