In the November 29, 1993 issue of Time Magazine, opposite p. 67, there is an interesting ad:

Give the Gift of Privacy

All it takes to eavesdrop on most cordless calls is another cordless phone, scanner or even a baby monitor. That's why every Motorola Cordless Phone features Secure Clear (TM) technology. Secure Clear (TM) scrambles voices, so all an eavesdropper hears is garbled noise.

Motorola

Motorola and Secure Clear are trademarks of Motorola, Inc. (C) 1993 Motorola, Inc.

- James -