[DNSB]

I tend to agree with @ownedbycats. When you download a DRMmed epub, Kobo sends you an urllink.acsm file. If you are using Windows, do you have show extensions for known file types enabled? You can try to open it with Adobe Digital Editions or using the DeACSM plugin for calibre.

When you open the file in a text editor, does it look somewhat like the text in the code box below?

<fulfillmentToken fulfillmentType="buy" auth="user" xmlns="http://ns.adobe.com/adept">
  <distributor>urn:uuid:<content deleted></distributor>
  <operatorURL><content deleted></operatorURL>
  <transaction><content deleted></transaction>
  <purchase><content deleted></purchase>
  <expiration><content deleted></expiration>
  <resourceItemInfo>
    <resource>urn:uuid:<content deleted></resource>
    <resourceItem>0</resourceItem>
    <metadata>
      <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/">The Way of Coyote: Shared Journeys in the Urban Wilds</dc:title>
      <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">Gavin Van Horn</dc:creator>
      <dc:publisher xmlns:dc="http://purl.org/dc/elements/1.1/">University of Chicago Press</dc:publisher>
      <dc:identifier xmlns:dc="http://purl.org/dc/elements/1.1/">web:9780226441610</dc:identifier>
      <dc:format xmlns:dc="http://purl.org/dc/elements/1.1/">application/epub+zip</dc:format>
      <dc:language xmlns:dc="http://purl.org/dc/elements/1.1/">en-US</dc:language>
      <thumbnailURL>https://www.bibliovault.org/thumbs/978-0-226-44158-0-thumb.jpg</thumbnailURL>
    </metadata>
    <licenseToken>
      <resource>urn:uuid:<content deleted></resource>
      <permissions>
        <display/>
        <excerpt/>
        <print/>
        <play/>
      </permissions>
    </licenseToken>
  </resourceItemInfo>
  <hmac><content deleted></hmac>
</fulfillmentToken>