Hidden Data Transmission Using Electromagnetic Emanations. ‘Your computer produces electromagnetic “emanations” that in some

cases contain enough information to reconstruct, for example, the image

on the screen. These emanations can sometimes be detected at a distance,

even across the street, and this fact has given rise both to legitimate

computer security research and to urban myths. One of the urban myths,

which takes various forms, is that Microsoft has secretly used emanations

from personal computers to look for pirated software. (This is)

a message about this myth from probably the foremost authority on the

subject.’ Red Rock Eater Digest