PDF Security - a myth?

In the whitepaper "How Secure is PDF?", Adobe Certified Expert (ACE) Bryan Guignard's conclusion on PDF security is -
The only way your property can be safe is if you keep it to yourself.

The site Giveaway Of The Day (GAOTD) is even giving away a commercial tool called Recover PDF Password for free. This tool unlocks restricted PDF documents & recovers passwords of protected PDF files.

As per comments at GAOTD, this isn't also the only tool. This comes as a rude surprise to me.

Sometimes, ignorance is not bliss.

Also see:
PDFZilla overrides PDF's copy protection
PDF Anatomy 101
A Web App Is As Secure As You Make It & the Browser It Runs On

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