This is a Playstation Network Exploit that lets you download things for free.
Here are the steps:
1) Have a friend that has bought the maps/whatever
2) Ask the friend to do this (obviously)
3) You need his/her email and his/her PSN password
4) Make a new profile on your PS3
5) Go to playstation network and instead of saying make a new account, press "use an existing account"
6) Enter his/her details
7) Go to Account Management (on their account)
Go to Transaction History
9) Highlight the maps and badda bing, download them.
NOTE: This only works for 5 different PS3s including the person that bought the maps
NOTE: You cannot delete the other profile, otherwise the maps disappear.
Now you've got this very useful tutorial, can I have the maps please?