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Request a Feature Report a Bug
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Last Updated: 22 Oct 2025 12:33 by ADMIN
Murugesh
Created on: 24 May 2019 13:46
Category: PDFViewer
Type: Bug Report
2
PdfViewer: InvalidDataException (Unknown compression method (0xAD)) is thrown when opening encrypted documents
Telerik.Windows.Zip.InvalidDataException for unknown (0xAD) compression method is thrown for some object streams.
2 comments
ADMIN
Peshito
Posted on: 22 Oct 2025 12:29

Hi,

As of Q3 2025 the issue is no longer reproducible.

Regards,
Peshito
Progress Telerik

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ADMIN
Dimitar
Posted on: 04 May 2020 06:24

Possible Workaround: 

Workaround:
Decompress use the qpdf third-party tool to decrypt the content (qpdf --decrypt). It will decompress the problematic stream correctly and the resulted PDF document will be successfully opened in the RadPdfViewer.
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