Securing a PDF or flattening a PDF

When you create a PDF from Indesign, it is possible to secure it to make it non-editable, for example if you have a watermark that you don't want people to be able to remove. However, there is a lot of software applications that can over-ride the security. Is it possible to create a secure PDF from Indesign that can not be tampered with or is it possible to completely flatten a PDF (like an image) so there is no editable elements. If not, is there any third-party apps (server based or with API's) that can make a PDF more secure?
Thanks, Tim

Yes, we're looking at the jpeg option. It's not as ideal for a customer though if they are looking at a 16-page brochure as it would mean 16 jpegs. Was hoping maybe there was a way to secure or completely flatten a PDF.
Hi Steve, the remove watermark feature in Acrobat does not remove our watermarks. Ours are added as .idms files at the Indesign Server stage when rendereing the proof PDF. However, it is possible to remove them with the touch-up object tool option in Acrobat and using the delete key, which is also easily done.
So, what I can gather from this is there is no real way of securing or comletely flattening a PDF when creating the PDF from Indesign. So, maybe there is a third-party application which can do it?
T

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