function check_ld_access( $can_access, $user_id, $post_id ) {

    if ( ! function_exists( 'sfwd_lms_has_access' ) ) {
        return $can_access;
    }

    if ( 'sfwd-courses' == get_post_type( $post_id ) && false == sfwd_lms_has_access( $post_id, $user_id ) ) {
        $can_access = false;
    }

    return $can_access;

}

add_filter( 'wpf_user_can_access', 'check_ld_access', 10, 3 );