Attachments that you find on this site are in a format called Portable Document Format (PDF), and to view them you must have a program that understands this format. There are several programs, the most free, able to display and print these documents. If you have not yet installed any, we recommend using Adobe Acrobat Reader, available in several languages ​​and for different platforms.

There are two main reasons why we use this file format for publishing documents on the site:

* Security: The PDF format is not easily editable. Documents downloaded from this site as PDF not be able to be easily modified by the person who obtained.
* Accessibility: The PDF format has become a standard for publishing documents online. Therefore, there are programs able to view PDF documents in a wide variety of platforms, so no technical limitations faced by visitors to the site so they can access information.