Who really cares about DMCA? If you’re copying discs you bought and aren’t sharing those copies, who would even know you did it? I view it as more of a way to theoretically throw the book at someone caught sharing than a way to imprison people who make personal copies.
DMCA doesn't specify a precise takedown period; service providers are simply required to "respond expeditiously" to takedown requests. What that means is a matter of interpretation, but seems to err on the generous side; the only case I'm aware of where a court found that a removal was insufficiently "expeditious" was one where it took seven months for the service provider to respond (Perfect 10 v. Google).
I am not a lawyer, so I'm not really sure how to interpret this stuff, but I don't know how tested the DRM parts of the DMCA have been tested .
[1] https://arstechnica.com/information-technology/2010/07/court...