I feel that I should note something about certain DRM locked games... The DRM isn't all that great on some. It creates a "hidden" storage wherein the actual game is contained upon logging in, and those contents can be copied to another location and set to a non-hidden attribute natively. It's not a real protection, just a facade that protects it against those who don't look deep enough. I know one or two games I had that had the DRM lock on it were both able to be exported to desktop and altered minimally to allow me access to them, without needing to sign in every bloody time. Sadly, I don't have a copy of this game that I'd be able to mess around with, so I can't offer any knowledge of how its DRM works.
If the developers want real protection, they shouldn't look to anything provided by DLSite, in my personal opinion.
P.S. For those unaware of what I'm talking about, in Windows go to "Folder Options", "View" Tab, look for "Hidden files and folders", and then tick "Show hidden files, folders, or drives." If you're not aware of how to find "Folder Options", just try going to "Control Panel" and typing in "Folder Options" or "Show Hidden" and it should pop right up. You might notice a difference in the folder containing your game, once you log-in to the DRM.
(In windows 7 you can go into "Appearance & Personalization" to find it if you're in category view, any other view from Control Panel should natively have it listed~)