/learn/events/b/blog/posts/q-a-from-elektor-academy---elektor-retronics-presents-historic-cryptographyWebinar Video players.brightcove.net/.../index.html Questions & AnswersQ: For the voice scrambler, were patents available that could be reverse engineered?A: Two very important branches in voice communication were and are CELP and MELP. Type inside..en-USTelligent Community 12