C&CZ pays for the network license for the concurrent use (by a small number of people) of Mathematica within the Faculty of Science. One can get the installation and license information from C&CZ system administration.
The use of Mathematica is logged by the license server.
On the Linux PCs that are managed by C&CZ, Mathematica can be found in /vol/mathematica. On MS-Windows PC's Mathematica can be found on the S-disk (software).