User-agent: *
Disallow: *?sort=date_desc
Disallow: *?sort=title_desc
Disallow: *?sort=url_desc
Disallow: *?sort=date_asc
Disallow: *?sort=title_asc
Disallow: *?sort=url_asc
Disallow: register.php/
Disallow: login.php/
Disallow: impressum.php/
Disallow: about.php/

User-agent: Googlebot
Disallow: *?sort=date_desc
Disallow: *?sort=title_desc
Disallow: *?sort=url_desc
Disallow: *?sort=date_asc
Disallow: *?sort=title_asc
Disallow: *?sort=url_asc
Disallow: register.php/
Disallow: login.php/
Disallow: impressum.php/
Disallow: about.php/
Disallow: rss.php/