AATL (Adobe Accredited Trust List)

The Adobe Approved Trust List (AATL) is a globally recognized trust program maintained by Adobe that defines which Certificate Authorities (CAs) are trusted for issuing digital certificates used to sign documents in Adobe products.

Certificates issued under AATL are trusted by default in Adobe applications such as Adobe Acrobat and Adobe Reader, enabling seamless validation of digital signatures without requiring users to manually install trust anchors.

AATL plays a critical role in establishing document trust, signer identity assurance, and long-term signature validity for electronically signed documents.

Purpose of AATL Certificates

AATL certificates are primarily used for:

• Digitally signing PDF documents

• Ensuring document integrity and authenticity

• Providing visual trust indicators in Adobe applications

• Supporting legally recognized and compliant digital signing workflows

When a document is signed using an AATL-trusted certificate, Adobe applications can automatically verify:

• The signer’s identity

• The issuing Certificate Authority

• The integrity of the signed document

• The validity of the signature at the time of signing

Trust Model and Validation

AATL operates as a root-level trust list embedded within Adobe products. Only CAs that meet Adobe’s stringent technical, security, and audit requirements are included in the list.

During signature validation:

• Adobe applications check the certificate chain against the AATL

• The signature is validated without additional configuration

• Users see a trusted signature status instead of warning prompts

This trust model ensures consistent validation across devices and environments.

Use Cases for AATL Certificates

AATL certificates are commonly used in:

• Enterprise document signing workflows

• Regulatory and compliance-driven document processes

• Contracts, agreements, and approvals

• High-assurance document authentication scenarios

• Cross-border and cross-organization document exchange

They are particularly valuable where recipients must be able to verify signatures instantly using standard Adobe software.

AATL in CERTInext

CERTInext supports the management of AATL-based publicly trusted certificates as part of its broader Certificate Lifecycle Management capabilities.

Using CERTInext, organizations can:

• Issue and manage AATL certificates from supported public CAs

• Track AATL certificates in the centralized certificate inventory

• Monitor validity, expiration, and lifecycle status

• Receive alerts for expiring AATL certificates

• Maintain audit-ready records of issuance and usage

AATL certificates managed through CERTInext follow the same governance, visibility, and lifecycle controls applied to other publicly trusted certificates.

Compliance and Long-Term Validation

AATL certificates are commonly used alongside:

• Timestamping services

• Long-Term Validation (LTV) configurations

• Document archival and compliance workflows

This ensures that signed documents remain verifiable even after the certificate expires, meeting long-term regulatory and legal requirements.

Key Benefits of AATL Certificates

Using AATL certificates provides:

• Immediate trust in Adobe applications

• No manual trust configuration for recipients

• High assurance of signer identity

• Reduced signature validation issues

• Strong alignment with legal and compliance frameworks

Thus Adobe Approved Trust List (AATL) establishes a globally trusted framework for document signing within Adobe ecosystems. By leveraging AATL certificates through CERTInext, organizations gain trusted document signatures, centralized lifecycle management, and enterprise-grade visibility - ensuring secure, compliant, and user-friendly digital signing experiences.