A Software Developers 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. The FREE PDF viewer download of the PDF-XChange Viewer may be used without limitation for Private, Commercial, Government and all uses, provided it is not -: incorporated or distributed for profit/commercial gain with other software or media distribution of any type - without first gaining permission.