> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/ac_admin/lokalelizenz/wl_lokale_lizenz/unstimmigkeiten.md).

# Inconsistencies in the use of file license keys (FLK)

The file license key contains copy protection that prevents illegal duplication or use of the licensed ACRON software on other computers and virtual machines.

For this purpose, a "fingerprint" of the computer on which ACRON is installed is created during the ordering process. This forms a checksum over various criteria by which the computer can be uniquely identified. The FLK is thus bound to this computer and the relevant hardware characteristics are compared with the fingerprint of this computer every time it is started.

If there are any discrepancies here, the DLS is deactivated and the use of ACRON is restricted. The copy protection of the FLK is particularly sensitive for virtual machines (VM), so that there is an increased risk of a false positive triggering of the copy protection when moving to a different hypervisor or making changes to the VM.

## Physical computer copy protection

The file license key is disabled if the motherboard UUID or the serial numbers of the installed hard disks have changed compared to the original fingerprint.

## Virtual machine copy protection

The file license key is disabled if at least one of the following criteria has changed from the original fingerprint:

* MAC address of virtual network adapter
* CPU Characteristics
* UUID of the virtual machine

Note

When cloning virtual machines (VM), be aware that this changes some characteristics of the virtualized hardware, which leads to the invalidation of the file license key.\
Therefore, we recommend to use a hardlock or promo license for configurations that do not take place on the customer's 'end device' or to [move the license](/acron-9.3/en/ac_admin/lokalelizenz/wl_lokale_lizenz/acron_lizenzverschiebung.md) to another hardware beforehand .


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