What is the difference between a digital signature and an electronic seal?

A digital signature (or qualified electronic signature, QES) is applied by a natural person, an individual, to authenticate their identity and intent. Under eIDAS Art. 25, a qualified digital signature has the equivalent legal effect of a handwritten signature. An electronic seal (qualified electronic seal, QESeal) under eIDAS Art. 35 is applied by a legal person, a company or organisation, to authenticate documents and prove their origin. A qualified electronic seal is not equivalent to a signature (no individual identity), but it is presumed to guarantee the integrity of the document and its origin from the issuing legal entity. For IP protection where a company is the rights-holder, an electronic seal is more appropriate than a personal signature.

When should a company use an electronic seal instead of an electronic signature?

Use an electronic seal when the authenticating party is the organisation itself, not a specific individual within it. Common use cases: automated document authentication (invoices, certificates, regulatory filings, bulk timestamping workflows), proving documents originate from a specific company in disputes, sealing contracts or IP documentation where the organisation is the rights-holder. Use an electronic signature when a specific natural person must be identified and bound, for example contract signing by a named director, regulatory filings requiring individual accountability. For sealing large volumes of IP documentation (code releases, design batches, research outputs), an electronic seal offers the legal integrity guarantee of Art. 35 without requiring individual identity verification.

Is an electronic seal legally binding in Switzerland?

Yes. Switzerland's ZertES (SR 943.03) and its implementing ordinances recognise electronic seals equivalent to those under eIDAS. A qualified electronic seal from a recognised Swiss certification service provider (accredited under BAKOM/OFCOM) creates a legal presumption that the sealed document is authentic and has not been altered since sealing. For Swiss companies using electronic seals on contracts, certificates, or IP documentation, this seal provides strong legal protection in Swiss cantonal courts and is recognised in EU proceedings due to the alignment between ZertES and eIDAS standards.

What is a qualified electronic timestamp and how does it relate to digital signatures?

A qualified electronic timestamp is distinct from both digital signatures and electronic seals. It does not authenticate identity or organisational origin but proves that specific data existed in a specific form at a specific date and time. Under eIDAS Art. 41(2), a qualified electronic timestamp carries a legal presumption of accuracy. It is bound to data using a qualified electronic signature or seal by the QTSP, which means it contains cryptographic integrity proof. For IP protection, a qualified electronic timestamp is often more appropriate than a signature or seal: you are proving creation date, not signing a contract. No counterparty is required, you can timestamp your own documents unilaterally.

Can an electronic seal replace a notary for document authentication in Switzerland?

In Switzerland, traditional notarization (public notary) fulfils specific legal requirements set by cantonal law, particularly for real estate transactions, company formations, and certain family law documents. An electronic seal from a qualified provider does not replace notarization for these statutory requirements. However, for the vast majority of business documents that do not legally require notarization, such as contracts, IP certificates, certifications, and regulatory compliance documentation, a qualified electronic seal from a ZertES-recognised provider offers equivalent authentication and integrity guarantees, at significantly lower cost and with instant digital processing. This is why qualified electronic seals and timestamps are rapidly replacing notarization for business-to-business IP and compliance workflows.

Digital Signature vs Electronic Seal: Legal Difference

Digitale Signatur vs. Elektronisches Siegel: Was ist der rechtliche Unterschied?

Unter eIDAS und ZertES haben elektronische Signaturen und Siegel unterschiedliche Rechtswirkungen. Dieser Leitfaden erklärt, welches Instrument Sie für den IP-Schutz bzw. die Vertragsunterzeichnung benötigen.

Philipp Stuppnik· Co-Founder & IP Strategy

·June 3, 2026· 7 Min. Lesen

Im Februar 2025 verwendete der CTO eines Zürcher Zahlungsdienstleisters DocuSign, um eine Geheimhaltungsvereinbarung mit einem externen Spezialisten zu unterzeichnen, bevor er den Authentifizierungsalgorithmus des Unternehmens weitergab. Das Projekt wurde abgeliefert. Neun Monate später hatte der Auftragnehmer ein nahezu identisches Produkt registriert. Die Anwälte des Startups stellten zwei Fragen: War die Geheimhaltungsvereinbarung mit einer qualifizierten elektronischen Signatur ausgeführt worden oder nur mit einer fortgeschrittenen? Und war der Algorithmus vor der Weitergabe mit einem qualifizierten Zeitstempel gesiegelt worden? Die Antwort auf beide Fragen war nein.

Der Unterschied zwischen diesen Instrumenten ergibt sich aus der eIDAS-Verordnung EU 910/2014 und dem Schweizer ZertES SR 943.03. Elektronische Signaturen und elektronische Siegel sind rechtlich unterschiedliche Instrumente mit unterschiedlichen Zwecken und Rechtswirkungen, die auf unterschiedlichen technischen Anforderungen beruhen. Wer das falsche Instrument wählt, riskiert Dokumentation, die rechtlich unzureichend oder unnötig komplex ist.

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Digitale Signatur vs. Elektronisches Siegel: Was ist der rechtliche Unterschied?

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