An acronym. It comes from something known as the "FUD factor," which is often used by software companies. For example, if Company B launches a new product, Company A will spin the FUD factor about B's product with the goal of delaying consumers' buying decisions until Company A can turn its vaporware into a product for sale. Company A may ask questions like, "Yes, but is B's product robust?" or "Is it scaleable?" or "Is it based on the latest industry standards?" It actually means "spreading fear, uncertainty, and disinformation."

from: FUD

FUD는 IBM에서 Microsoft로 이어져 지금은 SCO가 그 대를 잇고 있다.

SCO가 벌인 SCO_v._IBM_Linux_lawsuit참고