Summary:
This is an open source PDF is PDFCrack Pasuwadokurakka I would like to try.
This soft, pretty, well known colors are introduced at various sites.

Here, this is PDFCrack, or about how much you can crack a password, I would like to describe briefly.
Now, PDF is to set a password, PrimoPDF I have conducted. Try to set a password in conjunction with the description.

Description:
Gooo red that I know of one or OpenOffice? Can be downloaded from the following URL. The actual operation, OpenOffice same.

The difference is the speed (and lighter), had a small enhancement.
The small enhancements, but is also as good.

How to install OpenOffice is also similar.
Here, we introduce ITADAIMASU only enhanced lineup.

Description:
Speaking of the PDF viewer, Adobe's AcrobatReader you.
However, it is just slow, heavy, and many are limited function. I think so many people same. (In recent years, much has been improved) Still, users can maintain the format, some believed to prevent tampering PDF (= Acrobat) and continue to use. (PDF format out to replace the others, but also a dominant share of the PDF, not very much to break. )
The author himself, PDF format is to store documents for customers, to maintain the print format, as it looks to save history, I'm not used to the convenience.

In recent years, PDF of the Writer (spit out a PDF file from print) tools, are available free of charge. They have a Writer, Reader, and all before and was looking for.

To find the free Reader may reasonably. FoxitReader and other free Acrobat Reader The future may be known. However, many are used, it's not nearly all. For example, Acrobat Reader, you can see it very well, and is displayed in the image of a garbage garbage, document, and it will disappear and the line. And it is so, is fatal to those used in the printed image and to verify the author. The software is also light the soonest.

This is being looked at as free, I feel, that can tolerate (and rather light, almost the same view with Acrobat Reader), and further, to edit PDF-XCHANGE VIEWER simple, easy I guess I'm going to write.