Image - with Testbed at Unversity Koblenz Landau during COVID-19 pandemics - self - Editing and annotation was performed with LibreOffice Draw. The image contains derivative work from WikiCommons "Gnome-stock person.svg". This image incorporates derivative work of a GFDL CC-by-3.0 licensed GNOME desktop icon named "Gnome-stock person.svg" that is available on WikiCommons. Thus this image as a remix of existing source must be published under the same license constraints GFDL CC-by-3.0. The "Gnome-stock person.svg" was used 2 times in this image. The image editing was performed with LibreOffice Draw. As part of this remix operation

• the letter P2 was placed on one icon and
• markers for eyes, nose and mouth was placed on the second icon and the letter "S" for Student.

GFDL CC-by-3.0 - This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. This file includes derivative work that is GFDL CC-by-3.0 licensed and you are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

but the licensing must remain GFDL CC-by-3.0 to be in line with the incorporated WikiCommons "Gnome-stock person.svg".

This image incorporates derivative work of a GFDL CC-by-3.0 licensed GNOME desktop icon named "Gnome-stock person.svg" that is available on WikiCommons. Thus this image as a remix of existing source must be published under the same license constraints GFDL CC-by-3.0. The "Gnome-stock person.svg" was used 2 times in this image. The image editing was performed with LibreOffice Draw. As part of this remix operation the letter P2 was placed on one icon and markers for eyes, nose and mouth was placed on the second icon.

You may reuse the image under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Add an attribution to "Gnome-stock person.svg" if you modify this image as derivative work.
• share alike – Due to the fact that this image includes derivative work of "Gnome-stock person.svg" it is necessary that any remix, transformation and build upon the image must keep the same licensing and the redistribution must be under the same or compatible license as the original. Derivative work of derivative work must have a compatible licensing chain.