PDF Annotator是一个PDF编辑工具，可以在PDF文件中直接加入说明并将说明部分也保存为PDF格式。在它的帮助下，任何人都可以编辑PDF文件，这样可以节省大量的时间和资源。对于经常使用PDF文件的用户来说，它是一个不错的选择。

Annotate, Edit and Comment PDF Files
Add notes & annotations to any PDF document - comments, corrections, signatures, highlighting, even designs and drawings.   
Save annotations in the original file. Share them with coworkers, email them to partners or back to the authors - with no special software needed to view the marked up document.   
Type comments on top of PDF content, paste in images, use a stylus or drawing tablet if you have them.

Who needs PDF Annotator? - You do, if you want to:
Make a short comment on a long document
Fill in or sign a form or agreement, and return it by email
Proofread, review and correct a document right on your screen
Make notes and drawings right on the pages
Illustrate your ideas and suggestions
Correct student papers right on your PC, laptop or Tablet PC

Release: 1.5.0.136
- Fixed problem with Insert Image and Paste
  operations on protected documents
- Fixed problem with clickable links to files
  containing a relative path
- Cursor keys did not work until next page
  change after display rotation

Beta更新：http://www.grahl-software.com/betapublic/pdfannotator/std/en/History.txt
更新：http://www.grahl-software.com/pdfannotator/std/en/History.txt
官网：http://www.grahl-software.com/en/pdfannotator/

官方下载：
v1.5.0.136：http://www.grahl-software.com/pdfannotator/std/en/PDFAnnotatorSetup.exe
v2.0.0.229 Beta：http://www.grahl-software.com/betapublic/pdfannotator/std/en/PDFAnnotatorSetup.exe