AATL stands for Adobe Approved Trust List. It is an international program that allows users to create trusted digital signatures whenever a signed document is opened in Adobe Acrobat or Reader software. AATL works by using an “Approved Trust List”. GlobalSign is a member of this list. The AATL member CAs are carefully verified by Adobe to ensure that their services and credentials fulfil all AATL Technical Requirements. After a certificate authority has been added to this approved list, any signatures that are implemented with certificates that trace back to their root are automatically trusted in Adobe. Because GlobalSign Document Signing Certificates trace back to the GlobalSign root certificate, which is also included in additional trust/root stores, they can also be used for signatures in other software, e.g. Microsoft Office and Bluebeam Revu.