What is MIME type "application/vnd.adobe.adept+xml"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

The MIME type application/vnd.adobe.adept+xml is an XML format used by Adobe systems to handle digital rights management (DRM) messages. It plays a key role in processing instructions between Adobe servers and your device.

This type is mainly used with the ACSM file. The file acts as a gateway to validating and downloading DRM-protected digital content.

Secure License Delivery: Transports licensing data that verifies your right to access a digital resource.
Content Activation: Initiates the download and unlocking of DRM-protected media.
Data Exchange: Uses XML to format and exchange rights information reliably.

Using this MIME type ensures that the transfer of access keys and permissions is done securely, allowing only authorized devices to open protected content. For more details on Adobe DRM and its components, visit Adobe Digital Editions.

Associated file extensions

.acsm

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/vnd.adobe.adept+xml

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/vnd.adobe.adept+xml">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/vnd.adobe.adept+xml');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.acsm

FAQs

Why did I receive an application/vnd.adobe.adept+xml file instead of a PDF?

This MIME type represents a license token rather than the actual eBook. It instructs software like Adobe Digital Editions to verify your credentials and download the final PDF or EPUB content.

Which software opens files with the .acsm extension?

You need Adobe Digital Editions or a compatible DRM-enabled e-reader app. Standard PDF viewers and web browsers cannot process the application/vnd.adobe.adept+xml data structure directly.

How do I configure Apache or Nginx to serve this MIME type?

For Apache, add AddType application/vnd.adobe.adept+xml .acsm to your .htaccess or config file. For Nginx, include application/vnd.adobe.adept+xml acsm; inside the types { ... } block to ensure browsers handle the download correctly.

Can I convert an ACSM file to a regular PDF?

You cannot convert the file directly because it contains only text-based XML instructions. You must open the .acsm file in authorized software to download the actual book, which may then be viewed on supported devices.

What does the 'EADEPTREQUEST_EXPIRED' error mean?

This error indicates that the application/vnd.adobe.adept+xml token has timed out. These files often have a specific expiration window for security; simply download the file again from your library or vendor and open it immediately.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.