Expire is not really the right term; but effectively yes. In general a cheque older than six months will be considered stale-dated and will not be honoured. Reference the Canadian Payments Association FAQ.
SKYACTIV is a brand name for a series of technologies developed by Mazda which increase fuel efficiency and engine output. The initial announcement of the SKYACTIV technologies include new engines, transmissions, body, and chassis, which appeared in Mazda products from 2011.
ECam is a utility for the ASUS notebooks and netbooks that provides a means of managing the built-in webcam, taking pictures and more. E-Cam is a software program developed by ASUS. The most common release is 2.0.2.5, with over 98% of all installations currently using this version. The primary executable is named E-CAM.exe.