Why can Adobe Reader PDF documents be edited?
No. You cannot make permanent changes to PDF files using Adobe Reader; however you can perform many edit-like functions using Adobe Reader if the author has enabled these functions using Acrobat 7.0 Professional. For example, you can highlight text and add comments on sticky notes. If you’re looking to create and exchange documents, collect and compare comments, and tailor file security to distribute reliable and polished Adobe PDF documents…