I don't know if it can be useful :
Easy Script To Get And Install PPA GPG Keys (from Dominic Evans) http://popey.com/Easy_Script_To_Get_And_Install_PPA_GPG_Keys
"His script will not enable the PPAs, but for any PPA already enabled on your system it will go and get the necessary key and install it."
I don't know if it can be useful :
Easy Script To Get And Install PPA GPG Keys (from Dominic Evans) popey.com/ Easy_Script_ To_Get_ And_Install_ PPA_GPG_ Keys
http://
"His script will not enable the PPAs, but for any PPA already enabled on your system it will go and get the necessary key and install it."