At Leanpub, we currently don't do any DRM or watermarking.
However, we know everyone doesn't share our opinion on this issue, and we do have a "Custom Footer Text" feature you can use to add a copyright message to the bottom of every page, if you would like to.
To add a custom footer to every page of your book, go to the "Generation Settings" page for your book here:
https://leanpub.com/YOUR_BOOK/settings/generation_settings
...making sure to replace YOUR_BOOK with your book's unique web address.
You can also find the "Generation Settings" page on your book's "Overview" page:
On the Generation Settings page, scroll down and you'll see the "Custom Footer Text" section:
You can add a copyright-related text here, like this:
When you've added your text, scroll to the bottom of the page, and click "Update Book"
When you create a new preview of your book, you'll see the custom footer text at the bottom of most pages, like this:
If you have any feedback or questions about this article, please email the Leanpub team about it at hello@leanpub.com!
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Are you interested in self-publishing, and creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book
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