> I was all set to pay my money but then I read the terms. For one thing,
> it wasn't clear whether the eBook exists on my hard disk or whether I
> have to read a copy on their server. I can't tell whether these are
> DRM'ed. I'm due for a new computer in a year or two, and no way I read
> all those books before that date in time.
>
The books are offered as PDF and ePUB direct downloads to your hard 
drive. no DRM.