Microsoft's Digital Rights Management (DRM) is one method of protecting video content. DRM is the kind of thing that large media companies (e.g., Disney or Sony) might use to protect pay-per-view content. Camtasia does not directly support creating Microsoft DRM-protected content. However, the media files created with the Camtasia can be used as source files for other tools or services that do create DRM protected content.
For example, you should be able to use AVI files created by Camtasia (or WMV files created/encoded from AVI files using Microsoft's Windows Media Format SDK or Windows Media Encoder or SDK) as source content for a tool like Windows Media Encoder 9 Series along with an account with a DRM License Provider, to create protected content (see this page for a description).
There are various DRM service providers that can be used for everything from a License Provider for use with Windows Media Encoder up to complete DRM solutions. We think these DRM service/solution providers can use AVI files created by the Camtasia (or WMV files created by the Windows Media Format or Windows Media Encoder or SDK) as source content to create DRM protected content.
Since our products are not directly involved with creating DRM protected content, you will need to work with Microsoft and/or DRM Providers on issues of how to create and deliver DRM protected content