SOW vs devis vs proposition commerciale : quelle valeur juridique ?
Entre SOW, devis et proposition commerciale, les distinctions juridiques sont souvent mal comprises. Descobreix quels engaizen realment las partes y a partir de qué umbral.
8 min
Communication & marketing agencies
Electronic signature for communication agencies
Quotes, purchase orders, service agreements, confidentiality agreements with advertisers, subcontracting agreements with freelancers and copyright assignments: have all the documents that shape the life of a creative or media agency signed in minutes. Compliant with the Commercial Code, Intellectual Property Code, eIDAS regulation and article 1366 of the Civil Code.
Use cases in a communication agency
From advertiser brief to campaign delivery, all contractual documents of an agency can be signed online — including those that involve freelancers and media providers.
Client quote
Have each quote signed before production starts. Traced acceptance equals contract formation (article 1101 of the Civil Code) and prevents any contestation of the order placed — useful in Q3-Q4 when quote volumes explode.
Purchase order (PO)
Issue and have supplier POs signed (media buy, printing, post-production) with a qualified timestamp. The audit trail certifies the order date, which secures invoicing under article L441-1 of the Commercial Code.
Master agreement & referral agreement
Annual master agreements with recurring advertisers, referral agreements with large account procurement departments: multi-signatory signatures (communications director, procurement, legal) coordinated in a single envelope, 10-year archiving.
Creative brief NDA
Before the first presentation to a prospect, the confidentiality agreement protects your concepts. Electronic signature in less than 2 minutes on mobile to avoid slowing down the sales cycle.
Freelance subcontracting agreement
Brief, deliverables, deadlines and copyright assignment clauses (article L131-2 of the Intellectual Property Code) signed before the project starts. Dual-channel OTP formally identifies each freelancer.
Copyright assignment
Separate assignments of reproduction, distribution, adaptation rights: Certyneo''s advanced electronic signature (AES) meets the writing requirement of article L131-3 of the IPC and traces the express mention of each right assigned.
Why Certyneo for agencies
Six guarantees designed for agency constraints: high volumes, multi-stakeholder, strong seasonality and intellectual property.
Bulk sending for campaign peaks
Import 50 quotes or POs at once from a CSV, each envelope is sent with its signers and template — capacity designed to handle back-to-school weeks and Q4 without overloading production staff.
Mobile signature without account creation
Your advertisers and freelancers sign from their phone in less than 2 minutes, without downloading an app or creating an account. Observed conversion rate: 90% of signatures within 24 hours on quotes.
Audit trail admissible in court
Each envelope produces a signature certificate embedded in the PDF: timestamps, IP, OTP, SHA-256 hashes. Admissible before commercial courts in case of dispute over an order or copyright assignment.
10-year archiving with probative value
Duration aligned with commercial prescription (article L110-4 of the Commercial Code) and minimum duration for keeping purchase orders. Download at any time for tax audits or advertiser audits.
Compliant with eIDAS — advanced level (AES)
Signatures compliant with regulation (EU) No. 910/2014, recognized throughout the EU. Ideal for agencies working with European advertisers (Benelux, Germany, Spain) — the same certificate is valid in every jurisdiction.
API & agency workflow integrations
Webhooks, Zapier and Make to connect Certyneo to your CRM (HubSpot, Pipedrive), your project management tool (Asana, Notion, Monday) or your creative ERP (Workamajig, Boost). Automatic envelope creation from a validated quote.
Probative value of signed quotes and purchase orders
Under French law, a quote signed by a client equals contract formation (article 1101 of the Civil Code): acceptance binds both parties on price, scope and deadlines. Advanced electronic signature guarantees that acceptance is attributable to an identified person and that the document has not been modified after signature.
Certyneo delivers for each signed quote or PO an audit certificate embedded in the PDF, which includes all technical evidence:
- Signer''s identity (verified email, phone number confirmed by OTP)
- Qualified timestamp of acceptance — date enforceable against any late contestation
- SHA-256 hash of the quote as presented, which demonstrates the absence of subsequent modification
- Log of consultations (how many times the client opened the quote before signing)
- IP and approximate geolocation of the signer at the time of acceptance
This body of evidence prevents typical disputes ("the quote had been modified", "I never received this version", "the PO is not from me") and secures amicable recovery as well as proceedings before the commercial court.
Droits d'auteur, GDPR et secret professionnel
An agency handles sensitive data (confidential briefs, original creations, advertiser contacts) that require strict compliance framework.
Copyright assignment — Intellectual Property Code
Articles L131-2 and L131-3 of the IPC require writing that distinctly mentions each right assigned (reproduction, distribution, adaptation), the territory and duration. Certyneo''s advanced electronic signature meets the writing requirement and traces the creative''s express acceptance.
Commercial Code — invoicing & purchase orders
Article L441-1 requires keeping purchase orders and general terms for 10 years (article L123-22 of the Commercial Code). Certyneo automatically archives signed POs with their audit trail, accessible at any time for tax audits.
GDPR — données annonceurs et freelances
Hébergement 100 % UE (IONOS Allemagne), aucun transfert hors UE, chiffrement TLS 1.3 en transit et AES-256 au repos, DPA standard disponible. Conforme aux obligations GDPR pour le traitement des données personnelles des contacts annonceurs et des freelances indépendants.
Confidentiality of creative briefs
Advertiser briefs and creative proposals are encrypted and isolated by agency account. No Certyneo access to document contents (zero-knowledge on content), only metadata audit trail is viewable on the platform side.
Frequently asked questions from agencies
Does an electronically signed quote legally bind the customer?
Yes, without any ambiguity. Article 1101 of the Civil Code defines a contract as an agreement of wills intended to create legal effects: an accepted quote equals a firm order. Certyneo''s advanced electronic signature, compliant with article 1367 of the Civil Code, formally identifies the signer and guarantees the integrity of the quote as accepted.
How to manage peaks in quotes and purchase orders in Q3-Q4?
Certyneo integrates bulk sending: prepare a CSV with one line per customer (email, name, amount), upload your quote template, and the platform generates 50 or 200 envelopes in one operation. Each recipient receives a personalized link and signs on mobile without creating an account.
Are online copyright assignments enforceable?
Yes, provided the assignment is express, written, and distinctly mentions each right assigned, the territory and duration (article L131-3 of the IPC). Certyneo''s advanced electronic signature meets the writing requirement and identification of the creator. For high-value works, we recommend using the AES level (default on Certyneo) rather than SES.
Can you have an NDA signed in less than 2 minutes before a meeting?
Yes. You upload your NDA template, add the prospect contact''s email, and send. The contact receives a direct link, signs on their phone without creating an account, and the envelope comes back to you signed — typically in 30 seconds on the signer''s side, ideal before a creative pitch.
Does Certyneo integrate with HubSpot, Pipedrive or our project management tool?
Yes, via native Zapier connectors, Make and our webhooks. You can automatically trigger Certyneo envelope creation when a HubSpot quote is validated, or record the return signature in an Asana/Notion/Monday project. Our REST API is documented for custom integrations.
How long are purchase orders and contracts archived?
Our plans include 10-year archiving with probative value, which covers commercial prescription (article L110-4 of the Commercial Code) and the obligation to keep purchase orders (article L123-22). Documents and their audit trail remain downloadable at any time, even after agency account closure upon request.
Do European advertisers recognize our electronic signatures?
Yes. The eIDAS regulation (EU No. 910/2014) requires mutual recognition of electronic signatures between the 27 member states. An advanced signature (AES) issued from Certyneo (EU platform) has the same legal value in Germany, Belgium, Spain or Italy as in France.
How to manage signing by freelancers who have neither a professional email address nor KBIS?
No constraint on Certyneo''s side: the signer provides their personal email and phone, dual-channel OTP formally identifies the individual. The freelancer''s legal status (microentrepreneur, sole proprietorship, SASU) has no impact on the signature''s value — article 1366 of the Civil Code applies to any identifiable natural person.
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