Simple Electronic Signature: What It Is, Legal Status, and Limits

What is a Simple Electronic Signature (SES) and what is its legal standing?

The Simple Electronic Signature (SES) is the first and most basic level of electronic signature defined by the European eIDAS regulation. Its definition is intentionally broad: a set of "data in electronic form which is attached to or logically associated with other data in electronic form and which is used by the signatory to sign".

In simple terms? Any digital process that allows an act of signing to be associated with a document can constitute an SES.

Concrete examples of a Simple Electronic Signature:

• Ticking a checkbox to accept the terms and conditions of a service or a privacy policy.
• Clicking an "I Accept" or "Subscribe" button on a web portal.
• A signature typed at the bottom of an email.
• A signature process that involves entering your credentials (username and password) to access a secure area and approve a document.

What is its legal standing?

The eIDAS regulation establishes a fundamental principle: an electronic signature cannot be denied legal effect and admissibility as evidence in legal proceedings solely on the grounds that it is in an electronic form. This means that even the SES is legally valid.

However, its evidential weight is the weakest among electronic signatures. In the event of a dispute, it is up to the party who relied on the SES to prove its authenticity, the integrity of the document, and the link to the signatory. This is where the importance of a signature software that produces a solid audit trail comes into play.

The SES is therefore the ideal solution for low-risk, low-value agreements where speed and simplicity are the priority. For example, it's perfect for accepting policies, acknowledging internal regulations, or managing certain Documents for short-term rental property managers in the tourism sector, where the speed of the process is essential.

SES, AES, QES: The differences explained simply

To use the right tool at the right time, it's crucial to understand the differences between the three types of electronic signatures defined by the regulation. The choice always depends on the level of risk and the legal implications of the document being signed.

1. Simple Electronic Signature (SES)

• How it works: A logical association between data (e.g., clicking a button) and a document. It does not require strong signatory identification mechanisms.
• Legal standing: Admissible in court, but with a low evidential weight. The burden of proof in case of repudiation lies with the party that produced the document.
• When to use it: Low-risk agreements, acceptance of terms and conditions, privacy policies, approval of non-critical internal documents.

2. Advanced Electronic Signature (AES)

An AES goes a step further in terms of security and linking to the signatory. It must meet stricter requirements:

• It is uniquely linked to the signatory.
• It is capable of identifying the signatory.
• It is created using means that the signatory can maintain under their sole control (e.g., their own smartphone).
• It is linked to the signed data in such a way that any subsequent change is detectable.

A common example of an AES is a signature using an OTP (One-Time Password) code sent via SMS to the signatory's mobile phone.

• Legal standing: It has a higher evidential weight than an SES. It reverses the burden of proof: it is up to the person who disowns the signature to provide evidence of its non-authenticity.
• When to use it: Supplier contracts, rental agreements, private agreements, important commercial proposals.

The choice of signature type depends heavily on the business sector. For instance, in the property world, document management is complex and requires different levels of security. We've delved into this topic in our dedicated guide on Documents for short-term rental property managers for rental professionals, which illustrates the most common workflows.

3. Qualified Electronic Signature (QES)

A QES is the highest level of electronic signature, the only one with the same legal equivalence to a handwritten signature.

• How it works: It is based on a qualified certificate issued by an accredited trust service provider and is created using a secure signature-creation device (such as a smart card, a USB token, or secure remote signature systems).
• Legal standing: It has the same evidential effect as a private agreement signed by hand. It enjoys an absolute presumption of authenticity, integrity, and non-repudiation.
• When to use it: It is required by law only for specific acts, such as real estate sales contracts or opening a bank account. It is chosen for all very high-risk transactions.

When to use a Simple Electronic Signature (and when to avoid it)

Choosing a simple electronic signature is a question of balancing convenience and risk. Using it in the wrong context can expose your company to legal problems and the potential nullification of an agreement. Here's a practical guide to get it right.

Ideal Scenarios for a Simple Electronic Signature:

• Accepting Terms of Service: The classic "by ticking this box you accept..." is a perfect use case for an SES.
• Consent for Personal Data Processing (Privacy Policy): To collect GDPR consent, an SES is sufficient and appropriate.
• Acknowledgement of Internal Documents: Company communications, circulars, internal regulations that do not constitute an employment contract.
• Approval of Low-Critically Documents: Minutes of operational meetings, receipt confirmations, simple request forms.
• Registration for newsletters or events.

The common element is low contractual risk. In these cases, the priority is a fluid process and gathering proof of acceptance, even if it is not the strongest.

When an SES is definitely not enough:

You should avoid SES and move to at least an Advanced (AES) or Qualified (QES) Electronic Signature for all documents with significant legal and financial implications.

• Employment Contracts: Most employment contracts require more robust forms of signature to be valid.
• Real Estate Purchase Agreements: These legally require a QES or a notarial deed.
• Banking and Financial Contracts: Specific industry regulations mandate the use of AES or QES.
• Private Agreements of High Economic Value: Major supplier contracts, strategic commercial agreements, non-compete clauses.
• Documents to be submitted to public authorities that require specific signature standards.

The mistake to avoid is seeing SES as a universal shortcut. Its simplicity is its greatest strength, but also its greatest limitation.

How to implement a simple and secure signature workflow in your company

Adopting the simple electronic signature is about more than just asking clients to reply "I accept" to an email. To make the process professional, traceable, and more legally robust, it's essential to use a dedicated software platform.

A software like YouKont transforms a simple act of signing into a structured digital process.

Here are the concrete benefits:

1. Centralisation and Standardisation: You can create templates for the documents you use most often (e.g., privacy notice, quote acceptance). This ensures consistency, reduces errors, and speeds up sending.

2. Professional User Experience: Instead of an anonymous email, the signatory receives an invitation to sign on a clear, guided interface. This builds trust and improves the perception of your brand.

3. Creation of a Robust Audit Trail: This is the most important point. The platform tracks and records every single event related to the document: who sent it, the recipient's email, the IP address from which it was opened, and the exact date and time of viewing and signing. All this information is collected in a certificate of completion (or audit trail), a digital document that serves to "harden" the SES by providing concrete evidence to use in case of a dispute.

4. Secure and Compliant Storage: Once signed, documents are stored securely, protected from unauthorised access, and are easily retrievable. This solves the problem of messy paper files and documents scattered across a dozen different computers.

5. Flexibility: A good platform allows you to choose the most appropriate signature level. Today you might need an SES for a policy notice; tomorrow, an AES with OTP for an important contract. Having a single tool that manages both workflows is a huge operational advantage.

Implementing a system like this is no longer a complex and costly project. You can start digitising and securing your signature processes right away. Discover how easy it is with YouKont, Start your free trial.

Limitations and legal considerations of the Simple Signature

The main limitation of the Simple Electronic Signature, as mentioned, lies in its evidential weight. In legal terms, it is said to be freely assessable by a judge in court.

What does this mean? In case of a dispute, if one party repudiates the signature (for example, by claiming "it wasn't me who clicked that button"), the burden of proof falls on the party who produced the signed document. They will have to demonstrate, through additional evidence, that the signature is authentic and attributable to that person.

This is why the audit trail generated by a software platform is so crucial: it provides the judge with a set of digital evidence (IP address, timestamps, emails) which, taken as a whole, can strengthen the validity of the SES and make a frivolous repudiation difficult.

A practical use case: The short-term rental sector

The world of property management and short-term lets is a perfect example of how different types of signature can coexist. Accepting the house rules or acknowledging online check-in procedures can easily be done with a Simple Electronic Signature. In these cases, speed is everything.

However, for the short-term rental agreement itself, especially if handled entirely remotely, it might be wiser to use an Advanced Electronic Signature (AES) to provide greater security for both parties. We've gathered specific templates and procedures in our dedicated guide on Documents for short-term rental property managers.

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