There are two types of registration:

1. Viewer registration. (Free, but there are a limited numbers of slots).

2. Paper registration. Each presented paper requires one such registration (not necessarily by the author that will present the paper). This is done as there are fixed costs (per paper) for LIPIcs publication. One author may register for any subset of their accepted papers by paying the corresponding multiple of the registration fee. For example, if an author wishes to register for two accepted papers, they may do so by choosing "2" in the drop down menu for "Paper registration".