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Proprietary software, also called nonfree software, means software that doesn't respect users' freedom and community. This means that its developer or owner has power over its users. To know more about this please see here.
Usually these type of softwares also require you to buy a license. We have a license server with the aim of serving licenses to all machines in the Lorentz Institute should they need to run a proprietary software. However, we do not have unlimited number of licenses, therefore a license must be available for you to use a proprietary software.
To check the availability of licenses type for instance
For an extensive guide, please refer to this document.