erase contents from pdf

How to erase the contents from the pdf document:

We are using the many important documents in pdf formets and some of the documents are having the  unwanted contents  like the adds and the pictures .

Pdf eraser:

 we can erase it using the pdf eraser to remove this Unwanted contents. By using the freeware tool called the pdf eraser this pdf eraser will help to remove the pages ,adds and logos from this eraser. And also adds the contents of the pdfs. This software is only 28 mb you can google as the pdf eraser to download this software. it can work with the windows 8, 7 versions also