[unsignedint]

I think it's not necessary because "one is smart and other is not."

Here are some of my thoughts on this:

1) It's probably not a decision of people who understands deep understanding of technology and implication in bigger publisher. It could be some "suit" type of people who don't even know how DRM works, or their legal department.

2) Publishers can actually afford DRM -- I will be honest that I don't know how much DRM solutions actually cost, but activation servers won't run for free. Simply, a lot of independent studios don't have enough resources to maintain DRMs. DRMs would probably increase support case as well (there will be more support inquiries coming in; people will be running out of activation count, or their computer can't talk to activation server) which a lot of smaller studios just don't want to deal with.