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I've recently noticed that the look of Google search results differs between my Firefox and Opera. While Opera shows familiar older look, Firefox now shows a website icon, Google translate tool, etc. (screenshots). Is it just me or for everyone (an updated Firefox perhaps)? Brandmeistertalk 21:07, 15 December 2019 (UTC)
I downloaded the Casio fx-991EX user guide here:
https://support.casio.com/en/manual/manualfile.php?cid=004009138
When I look at it with Adobe Acrobat reader it looks fine, but when I try to print it it has a huge black diagonal "CASIO" across every page, making it unreadable.
Does anyone know how to either remove the watermark or where to download a printable version?— Preceding unsigned comment added by Guy Macon (talk • contribs) 22:46, 15 December 2019 (UTC)
There are 2 issues here which probably need to be discussed.
One: This PDF has permission restrictions. This means with any tool which respects these permissions you won't be able to edit it without knowing the owner/edit password unless these permissions are removed. Unsurprisingly this includes a lot of commercial tools, but also quite a few free ones. There are a lot of online only tools which can 'unlock' PDFs. I won't link to them because of DMCA concerns and also since I cannot guarantee that any of them don't add malicious data to the PDF even though I don't think this is a concern for your set-up. I will also say that our article QPDF says it can decrypt PDFs.
Two: This PDF seems to use a simple image watermark. Nothing fancy like some PDFs do to try and stop you removing it. If it is unlocked and you open it in a good PDF editor like Acrobat, you should be able to trivially remove the watermark.
A quick and dirty solution is to use the commandline/server PDFtk. (Note that the Windows version does respect security restrictions although I've heard this is removed in the Debian one.) Then do something like pdftk fx-570_991EX_EN.pdf output fx-570_991EX_EN.uncompressed.pdf uncompress verbose
(well you don't need the verbose). You can then explore the PDF in a text editor.
You should find 5 objects (30, 115, 153, 211, 262) representing the watermark since for some reason some pages have their own copy. On Notepad++ with the newline option, you can use \d+? 0 obj(?:(?!\nendobj).)*/Private /Watermark.*?endobj \n
to find these or make your own regex for your own editor. These all reference the same image, object 287.
You can use 287 0 obj.*?endobj \n
to select this object. If you delete either all 5 of the watermark objects, or the image, it shouldn't show up anymore. Your PDF reader will likely complain that the file seems corrupt since each page still references the watermark but should work fine if decent AFAIK. (It looks fine on Adobe Reader although I barely looked.)
You may be able to use some corruption repair tool to repair the PDF after you've partly removed the watermark, although PDFtk didn't work with a brief try. Alternatively, you can probably find tools maybe even PDFtk, or if not GhostScript to more gracefully remove the image or whatever. Finally, you can probably properly remove all references to the watermark via a text editor. If you need to send it, you may want to recompress it beforehand.
Someone on the HP forums solved this. See https://www.hpmuseum.org/forum/thread-14180.html
I am still going to try the suggestions above so I will be able to deal with similar situations in the future. --Guy Macon (talk) 16:49, 16 December 2019 (UTC)