"Open Content - A Practical Guide to Using Creative Commons Licences" was published by Wikimedia Deutschland, the German Commission for UNESCO and the North Rhine-Westphalian Library Service Centre (hbz) in 2014. Its intention is to provide interested individuals and organisations with practical guidelines for the use and application of open content licences: How do open content licences work? How do I choose the most suitable licence for my individual needs? Where can I find open content online? These are only some of the questions which these guidelines try to answer. Thanks to Dr. Till Kreutzer for writing these valuable guidelines.
You can read the guide either here on-wiki or download the PDF from Wikimedia Commons.