There exist different conversion matrices for converting between full and limited (TV) ranges of various color spaces.
See for example here:
https://software.intel.com/content/w...ml?language=en
https://web.archive.org/web/20120403...onversion.html
https://forum.doom9.org/showthread.p...62#post1936762
The EBU document just defines its "Preferred Range" which includes a typical (or practical) headroom/footroom to allow some overshoot/undershoot of the limited (TV) range. Something like halfway beteen 'limited' and 'full'.