Digital certificates

Distribution of VSL digital certificates


VSL is continuously improving its services to meet the needs of its customers and to apply the best available technologies in further digitization. VSL digitally encrypted certificates can be freely distributed to interested parties and authorities without loss of authenticity. Any change to the document “breaks” the digital seal and is shown on the document.

For an increased degree of independence and impartiality of the people involved in the calibration process and production of reference materials, VSL has installed a Certificate Committee for the release of certificates. This committee ensures that the documents comply with the requirements of international standards for calibration (SIO / IEC 17025: 2017) and production of reference materials (ISO 17034: 2016 / ISO Guide 31: 2015 and ISO 6141: 2015) and international agreements with the International Committee on Weights and Measures (CIPM).

Digital certificates are released by the VSL Certificate Committee with a digital watermark. This means that the document is signed with an electronic signature in accordance with the EU directive on a common framework for electronic signatures (1999/93/EC). All relevant information regarding the digital signature is included in the certificate below the signature window or can be accessed by clicking on the stamp.

With this method, VSL provides its customers with digitally certified certificates that comply with the legal regulations1 for digital signing

Authentication of documents

Since the digital certificates must be authentic, VSL will provide these valuable documents with a digital signature. This signature is a digital seal on the document that prohibits making changes to the documents. Any change to the document will "break" the digital seal and will be reflected in the document. This approach allows you or third parties to independently verify its authenticity and allows you to freely verify the document via email or other means, while keeping its authenticity valid.

When you or a third party open the document in Acrobat Reader (available for free download at, the encrypted document is automatically verified by the Internet for authenticity. The validity is shown in the header of the document.

More details can be verified in the signature window, such as the last validation over the internet. Just click on the digital stamp and the signature panel will open to display the details of the signature. This ensures that the document is from the original sender and no additional stamps or signatures are required.


Digital certifications, reports and validations of authenticity are the next step in VSL's ambition to work and communicate paperless. VSL continues the developments on a digital window for our valued relations and keeps you informed of the relevant status updates.

With this step, VSL is more future-proof. VSL understands, however, that this change will affect you and your processes. If you have any questions or comments, please feel free to contact us at


1. US legislation: Electronic Signatures in Global and National Commerce Act' (E-Sign Act, 2000) and Electronic Transactions Act (UETA, 1999)