PrimoPDF is a freeware program that creates a PDF file from Microsoft Windows documents. It works as a virtual printer. It does not present the user with advertisements. But does utilize the OpenCandy Adware program and per its terms of service, may use OpenCandy to recommend other software to the user. Wikipedia Original author(s): activePDF Stable release: 5.1.0.2 / July 26, 2010; 9 years ago Developer(s): Nitro PDF Software Operating system: Microsoft Windows License: Proprietary/Freeware Written in: C++, C#