Figured this out after finding this page:
http://www.0to5blog.com/tips/protecting-wordpress-media-uploads-unless-user-is-logged-in/
That page contains the instructions I was looking for, exactly!
I tweaked the dl-file.php code slightly to meet my needs:
if ( !current_user_can( 'read_private_posts' ) || !is_user_logged_in() ) {
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