libdvdcss.pkg will no longer install on OS X (now macOS).
Here's how to build and install libdvdcss.2.dylib so that you can use it with, for example, VLC and/or Handbrake.
wget https://download.videolan.org/libdvdcss/1.2.11/macosx/libdvdcss.2.dylib