Why is there so little written about Palo Alto Networks firewalls compared to other platforms?

Why are there no books of videos on Palo Alto Networks firewalls to be found on O'Reilly - Safari?
There are tons of books on Cisco, Juniper, Citrix. But nothing at all on PAN. Is PAN just very restrictive
about who can write about their products? PAN isn't brand new any more. Anyone have insight?
amigan_99Network EngineerAsked:
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Darrell PorterEnterprise Business Process ArchitectCommented:
Short answer:  Yes, they are extremely restrictive with the reins as to who they allow to produce educational material regarding their products and liberally sue publishers of unauthroised works for copyright and patent infringement.

The rather elitist that way.

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amigan_99Network EngineerAuthor Commented:
Interesting. Thank you!
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