BayernWLAN(In German Only) is available through the Munich Scientific Network (MWN) via LRZ-Access-Points. Because it is free to use and without data volume restrictions, it is a viable option when connecting to the Internet.
You do not need to set up a personal account. Just select @BayernWLAN and click on 'Verbinden' to complete the connection.
For additional information about BayernWLAN: LRZ-BayernWLAN
Important Note: Even though you have free access to the Internet via BayernWLAN, direct access to the library's eMedias is not possible.