Adobe InDesign 'Falure to PDF' error

I have created a template in Adobe InDesign for a style of document that is used quite frequently. Recently the completed documents have started throwing up a 'Failure to PDF' error when exporting to PDF. As far as I can tell the reason this happens is due to the security features related to any PDFs linked into the document. The copyright security features prevent the document from creating a new PDF incorporating any PDFs in the document. The best way to solve this I have discovered is to change the PDF files into jpegs, a really easy way to do this is to download Virtual Image Printer from www.download.com, it's free and creates pretty good quality jpegs, the relink all of the PDF files to the new jpeg version you have created, this should solve the problem. More info can be found on the Adobe Forums.