I tried to open a dvd movie with k3b but is says to install libdvdcss to get DVD video decryption support. However I downloaded the libdvdcss-1.3.99 and installed it without error messages. Any ideas why it doesn't work?

What OS are you using ?
if it is Debian 4 from many years ago, you will have problems in 2015

also
HOW did you install libdvdcss ( the current is 2 )

Following on John_VV's post, can you post the contents of your /etc/apt/sources.list file. Specifically, we need to know if you have included the http://deb-multimedia.org/ repositories.
jdk

Are you sure you weren't asked to download libdvdcss2 (from the non-free repositories)?

I use Debian Jessie.
I downloaded and unpacked libdvdcss-1.3.99.tar.bz2
apt-get install libdvdread4 (showed I had it already installed)
cd /home/user/Download/libdvdcss-1.3.99
# ./configure
# make
# make install
# make clean

I opened k3b again but it said I need to install libdvdcss.

Finally I opened open synaptic package manager and I tried to look for libdvdcss and I found libdvdcss2 and I marked it for installation. I installed that one and after that k3b worked. However it gave me the message that I still need to install transcode. I installed it in synaptic manager and reopened k3b but got same message. What to do now?

Is there any reason you are compiling the package rather than simply installing it? Just issue the following command (as root):
That's a lot easier than compiling the package from source.
jdk

Thanks for the correction... I didn't install with apt-get install because when I tried I actually typed libdvdcss and didn't work so I went to synaptic manager when libdvdcss2 was listed so I installed it.

Now since you mentioned it, I went and uninstalled transcode from synaptic manager then reinstalled it with apt-get. Guess what? It actually works now with k3b. Thanks, both issues solved

Well done! Glad to here that all is well now. Enjoy!
jdk