Is you version of Fedora 32 or 64bit? open the terminal and enter
bash-4.2$ uname -a
Linux penguinclaw.dom 3.5.0-2.fc17.x86_64 #1 SMP Mon Jul 30 14:48:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
the 3.5.0-2.fc.xfc17.x86_64 part means I am using a 64 bit version of Fedora 17, if yours says ..... x86 then you are using the 32bit version. Now check that you installed the correct version of libdvdcss2:
bash-4.2$ yum list libdvdcss2
if this doesn't match your version then you will need to remove and install the correct version of libdvdcss2. A good howto is available at: http://www.howtoforge.com/the-perfect-desktop-fedora-17
but again make sure if you have a 64bit system you download the correct software. Usually just opening a new tab in your browser and searching the site will give you the correct version.
I hope I'm not being to verbose.... It's a lot easier than it sounds
Also personally I'd use vlc as your dvd player. I'm sure this is mentioned in the above howto.