You don't have to buy adobe PDF builder, there are plenty of freeware on the market that you can use quite legally.

What is PDF?
PDF or Portable Document Format is a type of electronic document used all the time on the Web. It was developed to help people share information in documents created with different types of software. It is becoming common standard for online documents. Software can be expensive and not everyone may own, say, a copy of Microsoft Word, Microsoft Excel, or WordPerfect 2000. Yet it may be important to share information in documents created with that or other software. While a PDF document looks almost identical to a document created in Word or Excel or WordPerfect, you don't need a copy of the original software to use a PDF document. It can be opened, read and printed using a PDF reader, a small software program which often comes as part of your Web browser. You may also download the free software and install it on your computer

Using a PDF Document
All you need to do to use a PDF document is to click on the link to the document. If you have a PDF reader already on your computer, the document will open and you can read it, save it to your PC, or print it. If you don't have a PDF reader installed on your computer.

Security, copying information or extracting the text from a PDF file is very difficult, this is particularly useful for legal documents or authors who want to stop their work from being copied or misused in any way.