You're seriously trying to argue that people who commit copyright infringement do so maliciously, i.e. with the intent of harming the copyright holder? That seems... novel. And not very plausible. If true, however, it would be much more effective to ignore the work altogether, thus denying the copyright holder both direct income and free publicity.
> Any kind of security, authentication, or encryption software ever written was done so to "limit what you can do", so I don't think that is enough to constitute maliciousness.
The point of security, authentication, and encryption software is to protect the interests of the owner of the device. Defending yourself from malicious attacks by others is not an act of malice. DRM is malicious because it perverts the owner's computing resources to thwart the owner's interests and subverts their control over their own device.