I downloaded a pdf file, (paid for) and the seller has told me the file is not

password protected and should open up.

The pdf asks for a password when I use evince or qpdfview and I cannot open or

view the file(s). When I use MuPdf it does open without asking for a password

but its a very clunky program and I cannot view pdfs very easily.

Is there a way to eliminate the other programs from asking for a password?

Thanks.

Presumably a corrupted file. Or some kind of incompatibility between the software used to create the file and the software you're using to read it.

Most PDF files have quite a bit of metadata, which can be read using appropriate software tools. This will describe, among other things, the version number of the file and the software used to create it.

(PDF files are ... ahhh ... designed by committee. You'd think they'd be simple enough. Uh uh. Nope. Zippo. Nada. Nyet.)

Definitely check "the Horse's Mouth" ... Adobe® Reader, which is available for Linux.

I agree with all of sundialsvcs's points as well as this very apt choice. The file did open, just not with some of the choices you tried.

The seller told me I had to use adobe reader 10. Oddly enough..... Firefox opened up the file, I did it by accident. I guess firefox has a pdf plug in that works.

Thanks.