Connect a Monitor to my iMac with MiniDisplay - VGA cable

hello guys, I want to connect my monitor LG Flatron M1921A to my iMac via the Mini DisplayPort adapter - VGA, I read in the questions if the display does not support HDCP may be unable to play the video, but is it really necessary to have the screen with HDCP? if so what is the screen (cheap but good) do you recommend? if not, which cable should I use VGA or DVI? Thank for all answer

always dvi!
vga is analogue so it require the system to make the digital signal into an analogue one and then
the monitor convert it back to digital as only old crt screens use analogue
converting signals back and forth cost quality of the image and give issues with image placement adjustments

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+Message was edited by: den.thed+
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Connect a Monitor to my iMac with MiniDisplay - VGA cable

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