Node body protection
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Component body
Loads the node body (and teaser!) via AJAX so that it isn't visible when the user does "view source." There is also an option you can turn on that will also attempting to disable copy & paste via Javascript - but it doesn't fully work in all browsers and versions.
Remember: There is no way to completely stop someone who knows their stuff from copying your content!
This module isn't useful in most cases, but can be helpful if you're trying to deter people from copying your content.
Drupal 7
If I were to implement this same functionality for Drupal 7, I'd do it completely differently. I'd either make it a field formatter (so that you could setup individual fields to be loaded via AJAX) or as a build mode. In any case, it would be much cleaner.
At the moment, however, I have no plans for a Drupal 7 version.