If PID (you should also try 'Aray Scanner) doesnt detect any protection then its quite possible the game is protected with Securom Protection. If the game is installed use 'Aray scanner' and do a directory scan of the game directory.
If it has no protection or if it does in fact have Securom then use CloneCD like 'Luci' said.
Start CloneCD, choose 'Read to Image file', on the next screen choose your cd reader and click 'Next', then on the next screen choose 'Protected PC Game' then click 'Next'. Click 'Browse' to choose where you want to save the image, and name the image, then 'save' then choose 'OK', Now you are reading the CD and saving the image.
When the image finishes you will need to write it to a Blank CD.
Choose 'Write From ImageFile' now you should be able to work out what to dow from here! Just choose the writer and again choose 'Protected PC Game' as the Profile!
Hope this helps you accomplish what you are trying to do!
I find this is the best method to backup a Securom protected game! You will still need to use a NoCD exe to play!
