I still need help with this. Does anyone have any advice?

I apologize if this question has been asked many times. I searched extensively but could not find a thread which answered my question.

I have an active XOOPS community. I have a directory of content, including PDF and .Doc files, which needs to be easily accessible to members, but not in any way accessible to non-members. When logged in, I want the content to be freely available without having to enter another password, but when not logged in, I don't want someone to be able to access the content, even if they have its location bookmarked from a previous session.

What is the best way to do this? The .htaccess solutions I have found only make the content entirely unavailable or require another login, independent of the XOOPS authentication.

I appreciate whatever help anyone may provide. Thanks in advance.