Invalid, surely?
Looking at this from the UK side of the pond, does not a DMCA request refer to actual alleged "pirated" copyrighted material (music, etc), rather than the means to obtain same? Are the RIAA trying to exceed what little authority they appear to have or exceeding their remit by trying to have certain software taken down from third party sites or attempting to ban it altogether? As far as I can see cars, guns (for instance) and just about any other item you can name, might also just as well be banned, as they can ALL be used to kill people. The fact that perfectly legal software CAN be used for nefarious purposes doesn't necessarily mean it WILL. Methinks the RIAA may have tried to legislate something which they are not entitled so to do.
Biting the hand that feeds IT
