Absolutely yes. Legally you are allowed to make "back up" copies
of DVDs that you already own.
However deliberately bypassing technology put in place to protect copyrighted material that you do not own is illegal under terms of Section 1201 (Circumvention of copyright protection systems) of the Digital Millennium Copyright Act (DMCA).
"(a) VIOLATIONS REGARDING CIRCUMVENTION OF TECHNOLOGICAL MEASURES- (1)(A) No person shall circumvent a technological measure that effectively controls access to a work protected under this title"
Additionally if WikiAnswers were to provide you with information which would allow copyright to be bypassed, there is the possibility of a charge of contributory infringement. In Felton v RIAA: Corley v. Universal the mere posting of a link to a computer program that can be used to circumvent technical protection measures was held to be a violation of the DMCA. [Universal v. Corley (2d Ciruit cite)]