> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# License server requirements

> Hardware and operating-system requirements for the ABBYY FineReader Engine Licensing Service server — CPU instruction sets, RAM, and supported platforms.

* PC with x86-compatible processor (1 GHz or higher).
  * Note: For Linux, processor must support SSE and SSE2 instruction sets

* Operating system:
  * Windows
    * Windows Server 2022
    * Windows Server 2019
    * Windows Server 2016
    * Windows 11
    * Windows 10
    * Windows Server 2012 R2 with the April 2014 update rollup ([KB2919355](https://support.microsoft.com/en-us/help/2919355/windows-rt-8-1--windows-8-1--and-windows-server-2012-r2-update-april-2 "Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update: April 2014"))
    * Windows 8.1 with the April 2014 update rollup ([KB2919355](https://support.microsoft.com/en-us/help/2919355/windows-rt-8-1--windows-8-1--and-windows-server-2012-r2-update-april-2 "Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update: April 2014"))
    * Windows Server 2012
  * Linux

* Fedora 25, 24, 23

* Red Hat Enterprise Linux 7.2, 6.8

* openSUSE 42.1

* SUSE Linux Enterprise Server 12 SP1, 11 SP1

* Debian GNU/Linux 8.7, 8.0

* Ubuntu 16.04.1 LTS, 15.10, 14.04.5 LTS, 12.04.5 LTS

* CentOS 7.1

ABBYY SDK 12 Licensing Service has been tested in the following virtual environments:

* Microsoft Hyper-V Server 2012

* Microsoft Hyper-V Server 2012 R2

* Microsoft Hyper-V Server 2016

* Oracle VM VirtualBox 6.1.32

* Parallels Desktop for macOS 16.1.3

* VMware ESXi 6.7

* VMware Workstation Player 16.2.3

* VMware Workstation Pro 16.2.2

* 25 MB of free hard disk space

* Full control access to a folder with licensing information (%ProgramData%\ABBYY\SDK\12\Licenses folder by default)

* For activation/deactivation of the License:

* allowed connections to \*.abbyy.com

* port: 80 (except Online License), 443 (HTTPS)

* protocol: http

* GoDaddy Trusted Root Certification Authority (for Online License only)