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WritelyDividedEditing
WritelyDividedEditing
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January 29, 2026
Question

EPUB PKG-026 Obfuscated Font Media Type Error in InDesign Export

  • January 29, 2026
  • 1 reply
  • 35 views

An ePub I created for a client has the following error messages when she tries to upload it. I can fix the date in the metadata (oops! I always forget the order). However, I don’t know how to find the “PKG 26” “Obfuscated resource…” or what this error even is. What am I looking for in the file? Thank you!

    1 reply

    Abhishek Rao
    Community Manager
    Abhishek RaoCommunity Manager
    Community Manager
    January 30, 2026

    Hi ​@WritelyDividedEditing, 

    Thanks for sharing the details and sorry to hear that you experience this. Could you please confirm the InDesign version you are using along with your OS details? Also, let me know if the document includes any unsupported or third-party fonts. If yes, please try removing or replacing them and then test the EPUB export again. In the meantime, I recommend trying the suggestion shared in this similar community thread: https://community.adobe.com/questions-671/epub-obfuscated-resource-887720?postid=887720#post887720.

     

    Please let me know how it goes after trying the above. 

    Abhishek

    Abhishek Rao
    Community Manager
    Abhishek RaoCommunity Manager
    Community Manager
    February 27, 2026

    Hi ​@WritelyDividedEditing ,

     

    Just checking in to see if you were able to test the suggestions shared earlier. Has the EPUB validation issue been resolved, or are you still seeing the PKG-026 error?

     

    Please let me know how it’s going, and I’ll be happy to assist further if needed.

    Abhishek

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