What is a Qualified Electronic Signature (QES)?
A Qualified Electronic Signature (QES) represents the highest tier of electronic signature defined in the EU eIDAS regulation (Regulation (EU) No 910/2014, Article 25(2)). It is legally recognized across all 27 EU member states as having the exact equivalent legal effect of a handwritten pen-and-paper signature.
Unlike basic electronic signatures that rely merely on typed names or drawn scribble marks, a QES is generated using a Qualified Signature Creation Device (QSCD) and is linked to a qualified certificate issued by a recognized Qualified Trust Service Provider (QTSP). This architecture guarantees both the signer's authentic identity and the cryptographic integrity of the document contents.
Difference between SES, AES, and QES in practice
The European eIDAS regulation establishes three standardized levels of electronic signatures, each corresponding to different evidentiary requirements and risk profiles:
1. Simple Electronic Signature (SES): Includes typed names, email confirmations, or signatures drawn on a touchscreen. While legally recognized under Danish freedom of contract, SES carries minimal technical proof if the signer subsequently disputes their participation.
2. Advanced Electronic Signature (AES): Uniquely linked to the signer, capable of identifying them, and created using data under the signer's sole control. In Denmark and the Nordics, signatures executed with MitID or BankID function as Advanced Electronic Signatures, providing substantial evidentiary weight in arbitration and court proceedings.
3. Qualified Electronic Signature (QES): The gold standard across the European Union. A QES benefits from statutory presumption of integrity and authenticity, shifting the legal burden of proof onto any party attempting to contest the signature.
When should businesses use QES under EU legislation?
For the vast majority of commercial agreements within Denmark and the Nordic countries—such as employment contracts, NDA agreements, commercial leases, and supplier contracts—an Advanced Electronic Signature (AES) with MitID provides complete legal validity and bulletproof evidentiary security.
However, specific cross-border transactions and statutory filings in certain EU jurisdictions (such as Germany, Austria, and France) mandate a Qualified Electronic Signature by law. Common examples include formal notarized property conveyances, public procurement tenders, consumer credit agreements in specific member states, and cross-border corporate mergers.
How modern platforms handle Qualified Signatures
Historically, creating a QES required physical smartcards, specialized USB cryptographic tokens, and complex driver installations. Today, modern cloud-based trust services permit remote QES generation through video identification or certified national eID schemes.
KvikSign simplifies document dispatch by letting administrators configure required signature security tiers dynamically. Whether your organization requires frictionless touchscreen signing for day-to-day work orders or eID-backed PAdES seals for multi-million-euro B2B contracts, workflows proceed without technical obstacles.
Validation, audit trails, and Long-Term Archiving (LTV)
A digital signature is only as reliable as its ongoing verification capability years into the future. Digital certificates naturally expire or may be revoked by certificate authorities over time.
To ensure signed documents remain legally verifiable 5, 10, or 25 years after execution, modern signing engines embed Long-Term Validation (LTV) records, including certificate revocation lists (CRL) and Online Certificate Status Protocol (OCSP) responses directly inside the PDF. This enables standalone verification in software like Adobe Acrobat without requiring continuous connection to the original signing platform.