Here's Audible's policy for Public Domain in conjunction with ACX. No way of know what/if the policy is when it comes to more traditional publishers.
Quote:
Can I upload audio for a book that is Public Domain, or out of copyright?
Books that fall under Public Domain do not typically make good candidates for audiobooks; however, the only time we make an exception for Public Domain works is if your titles have met the following conditions:
In order to claim the rights to a public domain work, you must first make sure that it is, indeed, in the public domain.
You must have created your own version of the title by adding your own original content to it (i.e.; a historical introduction or fictionalized content).
You must have put your original version up for sale on Amazon.com in the books section. Please do not claim the rights to any other person’s public domain product.
You must have hired a narrator outside of ACX or narrated the book yourself. In such a case, you are welcome to upload the completed audiobook using our DIY (Do-It-Yourself) option.
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