All right, I've tried to defend Monte Cook, and the new site, and gotten attacked for it.
One thing I'll ask: A lot of people complain that there is no benefit for the consumer in this change. That's certainly true on the face of it, and I don't think Monte says otherwise. Some people have implied above that Monte is trying to say that he is doing this for the benefit of customers. I don't read it that way.
But what's wrong with DriveThruRPG and the publishers who sign on trying to enable some protections to their property? If it makes sense for their business, what's wrong with it? Malhavoc Press or any other publisher aren't obliged to provide unprotected PDFs if it makes better business sense to do otherwise.
Considering the widespread illegal trading of PDF files on the net, I think it's reasonable to do something to protect theft.
I don't know how effective this method will be. I don't see anyone offering better solutions. (EDIT: OK, that's not true but still, I don't think anyone knows a definite solution)
I certainly don't buy the argument that it will be ineffective because the DRM can be easily cracked. A lot of people won't bother to do even the 15 minute google-search. Anyway, it's not about preventing copyright theft, it's about reducing it, which may (or may not) have a positive effect on the site's and the publishers' revenue.
Regarding the problems with registering and sharing informtation wiht Adobe and what not, that may be a legitimate concern. I went ahead and did what was necessary to get the free PDF; I don't think it will have any negative consequences to me and I'm fine with it. Others clearly are not, but I guess that's the choice people have to make.
This issue is generating a lot of negative feeling and that obviously might lead to publishers on DrivethruRPG loosing customers, but I'm still not sure. I think some people complaining now will see one of Malhavoc's later cool releases, like Beyond Countless Doorways, and decide to go ahead and purchase it and download it despite the restrictions. If not, people can choose to buy the print versions, buy other companys' PDFs, or simply not to buy anything. Nobody's forcing anything on anybody.
Another thing to mention is that DriveThruRPG is selling print products previously unavailabe in PDF format. That's certainly a good thing.