Adobe's Brand Portal provides the ability to securely control, manage and distribute creative assets with external and internal groups, agencies and partners. 

Benefits

• Single source of truth to distribute approved digital creative assets
• Brand compliance and control over asset usage
• Manage user and group access
• Set expiration time on assets
• Removes the need for manual distribution through email and file share

Brand Portal Architecture

AEM can programatically synchronize with the the brand Portal and can integrate with AEM work flow processes to push approved assets at various stages within the workflow.

References: 

• Brand Portal 
  https://helpx.adobe.com/experience-manager/brand-portal/using/brand-portal.html

• AEM API Sync integration with Brand Portal
  Integration details https://helpx.adobe.com/experience-manager/kt/assets/using/brand-portal-technical-video-develop.html 
  Code on the ACS Commons: https://github.com/Adobe-Consulting-Services/acs-aem-commons/blob/master/bundle/src/main/java/com/adobe/acs/commons/workflow/process/impl/BrandPortalSyncProcess.java