There are times when a password is not considered to be secure enough for a PDF document. On these occasions, the solution is the power of encrypting the document. Here is a code sample to achieve this.
<cfpdf action="protect" source="generatedPDF" destination="secure.pdf" encrypt="AES_128" newOwnerPassword="thePassword" permissions="none" overwrite="yes" />
This code allows a person who has the permissions to open the file, but they can't print it or modify it. There are many permissions and they are listed at the end of the chapter. The point here is that we have lots of power to control our documents even after they "leave the building" as we put it.