From LinuxTag Public Wiki
Let us remind you to take care of your stuff at the booths, in the exhibition area, and the conference halls. LinuxTag takes no responsibility for any damaged, lost or stolen property. We offer a lockable storage room for your hardware and other things which need not to be at the booth during the night.
However you can contract insurance for hardware and stuff, including transportation at your own cost, provided by the Ausstellungsgut-Versicherung You can find further information in the Exhibitor Service Manual at Form E9 - Ausstellungsgut-Versicherung (Form F3 - Insurance for Exhibits - English Version).
In case you have questions, please contact Messe Berlin directly.