For a definition of OEM software, check here:

http://www.buycheapsoftware.com/faq.asp

For a definition of VCD, I recommend using Google or Wikipedia.

Web definitions for VCD

VCD stands for 'Video Compact Disc' and basically it is a CD that contains moving pictures and sound. If you're familiar with regular audio/music CDs, then you will know what a VCD looks like. A VCD has the capacity to hold up to 74/80 minutes on 650MB/700MB CDs respectively of full-motion video along with quality stereo sound. VCD’s use an encoding standard called MPEG-1 to store the video and audio. ...