Because you are selling access to YouTube video products in the the Digital Delivery extension, there are some settings in YouTube you should make sure are correct:
For your "Visibility" settings in YouTube, be sure to publish your videos as "Unlisted”. This will make your video more private by keeping it from being published publicly on YouTube.
In the "License" section, keep the default "Standard YouTube License" for your video.
In the "Additional Options" section, keep the default "Allow Embedding" option checked.