One, wikipedia rocks. Especially for technical topics I previously found hard to research like image encoding formats like YUV. Kudos to those who write pages there.
The adoption of SECAM in Eastern Europe has been attributed to Cold War political machinations: Western TV was popular in the East, authorities were well aware of this, and adopted SECAM rather than the PAL encoding used in West Germany. This did not hinder mutual reception in black&white, because the underlying TV standard B/G remained the same in both parts of Germany. However, East Germans responded by buying PAL decoders for their SECAM sets. Eventually, the government in East Berlin stopped paying attention to so-called “Republikflucht via Fernsehen”, or “defection via television”. Later East German produced TV sets even included a dual standard PAL/SECAM decoder. In any case the majority of TV sets in East Germany were monochrome (black & white) until well into the 1980s.