[en] Experimental energy and angular distributions of inclusive photoprotons produced on ¹²C by bremsstrahlung γ-quanta with maximum energy 4.5 GeV, at proton detection angle 20-120 deg and momenta 0.4-1.3 GeV/c are presented. It is shown that in the case of cumulative production the energy distributions of photoprotons are described well by the exponential, whereas for non-cumulative protons the spectrum is flattened out in the high-energy region. The experimental data obtained are analysed from the viewpoint of three theoretical models trying to explain the cumulative production of particles on nuclei