A few words of thanks would be greatly appreciated.

Mac - Saving a document in PDF format

Any document can be saved as a PDF file and are readable as long as you have a PDF viewer: Preview application (MacOS Default) or Adobe Acrobat.

For that, you simply:
Open the target document
Select File Print
In the Local PDF menu, select "Save As PDF" and then choose a name and location for the new PDF file
Fill in the blanks with the necessary information: Title, Author, Subject, and Keyword.

Note: You can use Spotlight to find the content.

Right now, if you want to encrypt your document or protect it with a password, click on "Security Options"