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Copyrights and Conditions of Use

Some of PTB's images and graphics are subject to the Creative Commons License. For the relevant license, please refer to the images/graphics in question. The license is also included in the image properties.
Currently, two types of CC license are used:

  • Attribution 4.0 International (Opens external link in new windowCC-BY) Creative Commons License Agreement
  • Attribution – no adaptations 4.0 International (Opens external link in new windowCC-BY-ND) Creative Commons License Agreement


Please indicate as source: Physikalisch-Technische Bundesanstalt
If you are able to quote at full length, please use the following format: "Image title, Physikalisch-Technische Bundesanstalt".
Further information about the Creative Commons Licenses: Opens external link in new windowCreative Commons.org