Handled InvalidDataException occurs while Zip Library tries to decompress wrongly decrypted stream.
Hi Nelson, your document seems to be more relevant to the following issue: http://feedback.telerik.com/Project/154/Feedback/Details/153358-add-radpdfviewer-add-support-for-encryption-algorithm-4 I will link it there as well.
When I try to open a secured pdf only to view, appears the message "Error loading document: The encryption method with code 4 is not supported."