FileOpen Systems provides a set of free plug-ins and viewers that can be used to access documents encrypted with the FileOpen software. These include plug-ins for Adobe Acrobat™ and Reader™, and …

This plug-in is required to open PDF files encrypted by FileOpen rights management software, and is authorized by Adobe Systems to load in Adobe Acrobat and the free Adobe Reader.

FileOpen Systems distributes a plug-in for Adobe Reader and Adobe Acrobat called FileOpen.api. Additional information about the plug-in is available in this FAQ.