I'm building a product that needs some video playback capability and rather than build the video circuit, I'd like to pick up a cheap MP4 player and integrate it into my product. The product has other functionality, but video is one aspect of its use. When I open other devices, I see several company names on the components. Is there a reseller license I need? Would I have to pay royalties or is buying the devices enough? Would it be better to pay to build my own video playback circuit?The video player brand will not be recognizable. Only the LCD screen will be seen and located inside of a custom built casing.