The roman numerals usually indicate the year the show was made.
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II. IX. MCMLXXXVII However, we don't normally express full dates in Roman numerals. Some countries, such as Portugal, use Roman numerals for the month alone (as in 2. IX. 1987), while film and TV productions often symbolise the year of production in Roman numerals in the end-credits. But never for a full date.
Today you mainly see them on the end credits of TV and Films, in books (showing the copyright), and on buildings (indicating the year built). Many sporting events use roman numerals to designate the event. (e.g. XXI Winter Olympics or Super Bowl XLIV).
Most TV productions and feature films tend to use Roman numerals to denote the year of production. There is no requirement to do so, however. It is just a traditional convention that has been retained by some production companies and ignored by others. There is no definitive list of which programmes use the convention and which do not.
I'm assuming you mean: What do the roman numerals MCMLXXIX represent? It represents 1979. You probably saw it in the end credits of a movie.
The BBC stands for British Broadcasting Corporation and not for Roman numerals but Roman numerals are shown after the credits of some of their programmes.