BPP Disk creates encrypted disk drives which can be mounted at any time. The software is fast, seamless, integrated and comes with ultra-high security 256-bit PMC encryption.

A comprehensive archive of cryptography programs. Includes a lot of filesystems. (Available on CD or their ftp site)

Polymorphic on-the-fly harddisk encryption developed by CyProtect AG. Easy to use and 100% secure. It is possible to encrypt your data on external (USB or Firewire) and internal harddisks.

Sells software protection devices, copy protection, license management and encryption technology and anti-piracy solutions.

Hard Disk encryption kit, the hardware solution for PC data security.

Uses 256 bit encryption. Supports steganography, allowing you to hide entire hard disks into music files.

Delivers full hard disk encryption: automatic, on-the-fly data protection for your entire hard drive. Easy centralized administration for efficient corporate use.

Real-time hard drive encryption kits external TV box.

Sentry 2020 for Pocket PC is an enterprise security tool utilizing transparent encryption to protect important information stored on Pocket PC computers. Seamlessly encrypts documents while they are being accessed by Pocket Word, Pocket Excel and other applications.

PGP products keep your confidential information secure.

As of version 6.5, PGPdisk is not longer included with the freeware versions. If you want PGPdisk 6.5 or later, you are required to buy one of the commercial versions. However, v6.0.2i is available here in both mac and pc versions.

Control Break provides encryption and security tools which are both secure, and easy to administer - designed primarily for the large enterprise, they also offer a range of consumer verisons.

Transparent on-the-fly encryption of logical drives for Windows 3.1, 95, ME and 2000

Dos TSR program that can encrypt both floppy and hard disk partitions. Compatible with PGP 2.x keyfles. I have used this and it works great. Unfortunately it doesn't look like the programmer has made any enhancements to it for a while.

Create and manage a number of encrypted disk volumes. Runs under both DOS and Windows 9x. Not updated since '96

The first security system that protects volumes, files, folders and programs quickly and easily

Disk drive that automatically encrypts all data blocks written to it and then transparently decrypts them for any application, if logged in. Once logged out, the special disks are completely unreadable by unauthorized users and thieves.

Enterprise-wide multi-platform security product. Transparently access encrypted files. 100% transparency, zero administration. Filesystem independent. Network ready.