The SECAM signalThe French TV system did not use NTSC but SECAM which is a lot like PAL. To decide how much to decal a line, Discret 11 uses a secret 11-bit key (hence the name). Discret 11 modulates the signal via AM using a carrier signal of 12.8 kHz (with a low-filter to avoid aliasing). In December 1984, Radio Plans magazine almost printed the Discret 11 schematics but was legally barred from it by a court decision. The encryption system was updated to Nagravision encryption in 1992 and Discret 11 was retired by 1995.