GSView is described as 'Use Ghostscript GSview to open PDF files with owner password restrictions. The Ghostscript-based PDF viewer disregards Adobe security settings. You can print a restricted PDF file, convert it to other formats, or extract text content and export it as plain text'. There are more than 10 alternatives to GSView for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Ghostscript, which is both free and Open Source. Other great apps like GSView are QPDF (Free, Open Source), Stellar Repair for PDF (Paid), iSafePDF (Free, Open Source) and PDF Password Remover Tool (Free).
It could have been called something like pdf-to-pdf. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work.
Stellar Repair for PDF It is an effective Windows-based PDF repair software that can repair damaged PDF files. It restores forms, headers, footers, word art, clip art, page format, shapes, charts, and tables enclosed in the PDF files.
iSafePDF is a free open source PDF protection software. It allows you to encrypt PDF document, sign them using a certificate and timestamp the signature. All those features are PDF standards so your document will be readable/editable with all standard PDF programs.
For 9.99 $ A-PDF Restrictions Remover is extremely easy to use. Just right click the PDF file in Windows Explorer, and in the context-sensitive menu that pops up, select either the "Remove Restrictions" or "Remove Restrictions & Save as..." option.
Freeware PDF Unlocker is a simple and useful application for 32bit-Windows, that will remove the password and restrictions on any PDF file that you can read. There are two types of passwords that can be used in a PDF file.