In software sources I have two entries that say Added by software-center; credentials stored in /etc/apt/auth.conf.
I can see on the URIs that they are sources for software I have bought (for 0 $) in the Software Center, and removed again.
Now I have a lot of sources, as I experiment with some PPAs, so updating them ís not as fast anymore, so I would like to know if I can safely remove these entries, and still be able to install the software again later?