I guess I should clarify, there is no way to do it for free. That I know of.
Please Visit http://jeffwhetstone.com/forum if you have any more questions.
Here is a good link to help you understand Unix file permissions:
http://jeffwhetstone.com/forum/viewtopic.php?f=63&t=184&start=0
You would want to chmod the files to the correct permission for the use of the file and the group.