Adobe Reader XI is a free PDF viewer designed to reliably open, print, and interact with all types of PDF content, including forms and multimedia. The 11.0.23 update specifically addressed security vulnerabilities and included bug fixes for accessibility and PDFMaker. Key Features of the XI Release
Users can add sticky notes, highlight text, and use shapes, stamps, and a typewriter tool for annotations. adobe acrobat reader xi 11.0.23 download
Features a "Protected Mode" (sandboxing) to isolate the application and protect the host system from potentially malicious PDF files. Adobe Reader XI is a free PDF viewer