Posted May 21, 2014
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Let's take GOG as an example. The login on GOG serves to establish your individuality ( meaning it's targetting you as an individual and not your files on GOG.COM) and grant you acess to the files you should have acess to. GOG's catalogue is a common pool or resources for all of its users, the Login serves to 'distribute' those resources accordingly.
IF the login procedure is bundled with file mananagemet sofware or similar (clients, downalodaers et all) then there's DRM at play but not by virtue of the Login but by virtue of the bundling.
DRM, if present, starts at delivery (download), the point at which you propose to start making use of your files. Login comes before that, targets you not your files, and serves to establish which files you're elegible to use in the first place.