Subaru/SuprimeCam narrowband photometry of the SSA22 field reveals the presence of four Lyman continuum ( LyC ) candidates among a sample of 14 AGN .
Two show offsets and likely have stellar LyC in nature or are foreground contaminants .
The remaining two LyC candidates are Type I AGN .
We argue that the average LyC escape fraction of high redshift low luminosity AGN is not likely to be unity , as often assumed in the literature .
From direct measurement we obtain the average LyC-to-UV flux density ratio and ionizing emissivity for a number of AGN classes and find it at least a factor of two lower than values obtained assuming f _ { esc } = 1 .
Comparing to recent Ly \alpha forest measurements , AGNs at redshift z \sim 3 make up at most \sim 12 \% and as little as \sim 5 \% of the total ionizing budget .
Our results suggest that AGNs are unlikely to dominate the ionization budget of the Universe at high redshifts .