Did Sony produce LOTR? If they did, it's likely that they used their strange copy-protection scheme in addition to CSS. When trying to simply rip, the reader will encounter read errors due to the, quite frankly, fucked up navigation structure and protected (re: bad) sectors of the disc. I've found this protection on All The King's Men, Talladega Nights, Employee of the Month, and a few others so far.
The solution is to use RipIt4Me combined with FixVTS, DVD Decrypter, and optionally DVD Shrink. FixVTS creates a protected sectors list so that DVD Decrypter can identify these sectors and insert "dummy" sectors. While the copy protection has been compromised rather easily, it still makes a rip take 2-3x as long, depending on how many of these annoying sectors Sony decided to insert.
Props to Sony for merely postponing the inevitable once again.