Adding key to apt so ppa packages can be authenticated

I use a program called KeePass on Windows to manage passwords. There is a project called KeePassX for Linux that will use the same password database file I use on windows. To install it on Ubuntu 9.04 AMD-64, I did the following:

Add the source to Ubuntu (System > Administration > Software Sources)

deb http://ppa.launchpad.net/keepassx/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/keepassx/ppa/ubuntu jaunty main

Add the project signing key to apt:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 095F1873
The signing key from launchpad was 1024R/095F1873 (note the part after the slash is used in the apt-key command.
The ppa page from which I got this information:
https://launchpad.net/~keepassx/+archive/ppa?field.series_filter=jaunty