Method and apparatus for masking sound

Method and apparatus for preventing external detection of...

Method and apparatus for providing privacy/security in a...

Method and apparatus for scrambling and descrambling of...

Method and apparatus for scrambling and unscrambling data...

Method and apparatus for secure distribution of...

Method and apparatus for subscription broadcast

Method and apparatus for the modulation and demodulation of...

Method and apparatus for the reliable authentication of...

Method and apparatus for the scrambled transmission of...

Method and apparatus for the secret transmission of speech...

Method and apparatus for transceiving cryptographically...

Method and apparatus for transmitting and receiving a...

Method and apparatus for transmitting and receiving...

Method and apparatus to maintain encryption synchronization...

Method and device for coding and/or decoding and securing data

Method and device for transmitting informations between...

Method and installation for masked speech transmission over...

Method and system for enciphering and deciphering...

Method and system for processing electronic documents