Leanpub courses currently just support unlisted (and public) YouTube videos.

Our opinion has always been that security and/or DRM is basically a waste of time for ebooks, and this applies for courses and videos as well...

Unlisted YouTube videos are obviously not "secure", but in this case, security through obscurity is exactly the correct balance between security and convenience. As always, as a content creator, your real threat is that nobody wants to read or watch your stuff...

For a much longer explanation of our position on this, see this book.

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