As Richard pointed out, ISBNs are not always used correctly.

UPC codes are traditionally 12-digit codes (and are also frequently re-used
and unreliable). And many DVDs have been assigned ISBNs because they are in
the book supply chain  B&N sells quite a few DVDs, for example. So some
studios got in the habit of requesting blocks of ISBNs for assignment, for
the bookstore market.

So it's entirely possible that the DVDs have ISBNs.

From:  Karen Coyle <[log in to unmask]>
Reply-To:  <[log in to unmask]>
Date:  Friday, August 2, 2013 4:26 PM
To:  <[log in to unmask]>
Subject:  Re: [BIBFRAME] Modeling Question

 Mac, I believe that those are UPC codes - barcodes - but not ISBNs. Does
anyone know for sure? Laura?
 From the Bowker site:
 "  The ISBN identifies a book or other book-like product (such as an
audiobook) in a specific format and edition, but also the publisher."
 and from their FAQ:
 DVDs DVDs may not get an ISBN if they are entertainment or performance
videos. If the DVD is instructional or educational, then the DVD is eligible
for an ISBN. However, retailers vary in their requirements regarding the
type of product identification. Publishers should check with their retailers
for requirements. If the DVD is eligible for an ISBN, the ISBN is placed
near the copyright line on the packaging.
On 8/2/13 10:49 AM, J. McRee Elrod wrote:
> Karen said concerning ISBNs:
>> ... it's only be in use for the last 50 years of book
>> publishing, only covers books ...
> About 1/3rd of the DVDs we do now have ISBNs, as well as often other
> standard numbers.  While it is true books published earlier lack
> ISBNs, so do some modern books.
> There is also the question of erroneous ISBNs, and a single
> manifestation with more than one ISBN, e.g., simultaneous publication,
> different bindings.
> There are also several other standard numbers for books and
> bibliographic records to be considered.
>    __       __   J. McRee (Mac) Elrod ([log in to unmask])
>   {__  |   /     Special Libraries Cataloguing   HTTP://
>   ___} |__ \__________________________________________________________
Karen Coyle
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ph: 1-510-540-7596
m: 1-510-435-8234
skype: kcoylenet