This matches my experience--a friend and I were among those "early adopters" who published PDFs back in the D&D 3.0 days, and nobody was using DRM then; first, nobody wanted to pay the license fees to Adobe or whomever (most of us couldn't afford them in any case), and second, all it would have done was piss off our customers anyway. Later on (in the D&D 3.5 days), as you say, third-party PDF distribution services started offering DRM, but even then there wasn't a lot of uptake that I could see.
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This matches my experience--a friend and I were among those "early adopters" who published PDFs back in the D&D 3.0 days, and nobody was using DRM then; first, nobody wanted to pay the license fees to Adobe or whomever (most of us couldn't afford them in any case), and second, all it would have done was piss off our customers anyway. Later on (in the D&D 3.5 days), as you say, third-party PDF distribution services started offering DRM, but even then there wasn't a lot of uptake that I could see.