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Software components for data protection, secure storage and transfer


Instant control over file and folder operations in Windows and .NET applications

CallbackFilter lets you monitor and control disk activity, track file and directory operations (create, read, write, rename etc.), alter file data, encrypt files and much more...

CallbackFilter is a component for use in software development for Windows® platform.

Clients say:

On-the-fly encryption of data provided by your CallbackFilter component came very handy.

Latest version

Release:  4.1.105
03 March 2017

Pre-release:  5.0.110
09 June 2017

Most wanted features Vote or request a feature


CallbackFilter - filesystem filter SDK for Windows - architecture

Implement continuous data protection (CDP)

You can now control access to files on file system level. CallbackFilter allows encryption and decryption of files on-the-fly. You may assign specific permission schemas of data access to authorized users or applications. All file system calls can be analyzed and treated before passing them to underlying file system.

Secure individual files and regulate access to them

Secure individual files by encrypting and decrypting them on-the-fly. You can control which applications may read the decrypted files and when (eg. after the user has entered the password). And you can apply strong industry-standard encryption algorithms offered by SecureBlackbox.

Audit application access to files

Control any actions of file-accessing applications. You can intercept any file system call, analyze it content, log it, modify, permit its execution or cancel it altogether. This control may be based on any file parameters, such as its location, type, size, etc.

Proactively intercept and modify file access requests

With CallbackFilter you can be proactive and implement rule-based request interception. An intercepted request can be analyzed, its parameters modified or logged - all this before file system executes it.

Create virtual files and directories

CallbackFilter lets you create virtual files and directories on existing disks. Such files and directories are recognized by Windows and applications as real files, but in fact they don't exist on the underlying disk.

Replace ineffective FileSystemWatcher class

With CallbackFilter you will not miss a single filesystem event and will get all event details. And you can even modify or prevent the filesystem operation if needed. See how CallbackFilter bypasses limitations of FileSystemWatcher class.

Audit registry operations

If you need to filter requests to Windows registry, see our CallbackRegistry product.

Track process and thread launch and termination

If you need to be notified (and possibly influence) process- and thread-related operations, see our CallbackProcess product.

Miss a feature? Tell us about your idea using Wish List.

For more technical details about CallbackFilter, refer to the detailed specs, or download your own copy to try CallbackFilter for free. Ready to pull the trigger? Refer to the Prices and Ordering page for complete licensing information.


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As of July 15, 2016 EldoS business operates as a division of /n software, inc. For more information, please read the announcement.

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