F7 repo contains the packages that its install dvd has not. Why?

[Strong]

I installed through yum a package. And it needed a dependancy,
called libcaca. Yum found it to be on fedora repo. I use F7. I wanted
to install it from my F7 install dvd. But i did not find such a
package. So, my question is: Are not the fedora repo and its install dvd
similar package sets?