Why is FlexiPDF asking for a password?

[Woody44]

The (U.S.) NTSB (National Transportation safety Board) final report on the loss of the tourist submersible Titan is been released. The report is an 87-page PDF.

When I try to open it with FlexiPDF, I get an error message telling me that a password is required. Yet the file opens fine with Adobe Reader XI, Foxit Reader, Bluebeam Vu, and with Lightning PDF Professional. The document was created by a government agency and distributed for public consumption. It obviously is not password protected, so why does FlexiPDF (and FreePDF) report that a password is required?

Link to report: https://www.ntsb.gov/investigations/Acc ... IR2536.pdf

[stascheit]

However, if you check the document properties — for example, with Adobe Reader — you will see that write protection (not read protection) is active.

So if other readers do not display a message, but FlexiPDF displays a message about password protection, I don't think this is wrong.
In FlexiPDF, you can still open the document for reading just like in any other PDF viewer.