Blending the storefront with a DRM solution? No, that was them.
That's their entire call to fame. They first turned their auto-patcher into a DRM service, then they enforced authorization of physical copies through it and eventually it became the storefront bundled with the other two pieces. If somebody did it before them I hadn't heard of it, but I'll happily take proof that I was wrong.
None of the pieces were new, SecuROM and others had been around for years, a few publishers had download and patch managers and I don't remember who did physical auth first, but somebody must have. But bundling the three? That was Steam.