This is a disgracefully unstable program. Its intermittent hiccups ans hangups has been the worst in my life time using PCs. Watch for all kinds of little boxes and uncheck them. In FREE mode, many menu items will be marked with a special marker that indicates that the specific feature requires a PRO license to use without producing watermarks. PDF-XChange Viewer 'Free Version' is free for private and commercial use, provided it is not bundled with other software for financial gain.
A Software Developers Viewer SDK is available including for licensing in 3rd party software applications that require the functionality of a PDF reader, or the ability to edit PDF files from within their own applications, without exorbitant royalty fees. Additional Language Extension Packages are available here.
