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If you want to validate a StepOver signatures signature in Adobe Reader/Acrobat you would normally see that the identity of the signer is unknown. This is because a "self-signed" certificate is used for the signature, which is not trusted by Adobe Reader/ Acrobat by default. To change that, you have to install the appropriate Root-CertificatesCertificate.

There are 2 4 certificates:

  1. The StepOver GmbH Root CA (SORootCAProductive.cer) is necessary for all signatures captured with StepOver signature pads where the “HashHash-Dialog” Dialog is enabled (SORootCAProductive.cer is the older 2048Key length Certificate, HWRootCertificateStepOverEuropa4096.der is for the newer 3072 and 4096 keys).
  2. The StepOver GmbH Software Root (SOSoftwareRoot.cer) is for necessary when the Hash-Dialog is disabled , or a 3rd party device (e.g. a Tablet PC) was used for capturing the signature.


  1. (SOSoftwareRoot.cer is the older 2048Key length Certificate, SWRootCertificateStepOverEuropa4096.der is for the 4096 key).

Installer for the certificates

The setups of Signature APISignAPI, SimpleSigner or eSignatureOffice have an option to install all StepOver certificates to the Windows certificate windows cert store and to set an option inside Adobe to trust the Windows certificate windows cert store. We also offer a small setup for this certificates installation only: 


Manual installation guidelines manual Installation Guidelines for Adobe Reader / Acrobat


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rootValidation of signed documents

You can download the certificates here:Download certificate here: