So, if I understand it correctly, only possession of the documents is a reason for the penalty. That's an interesting thought: apparently you can get a team into trouble easily, by simply sending them the documents. When the possession is proven, they're out of competition.
The report is now available on the FIA website, which gives a fuller picture of the issues:
http://www.fia.com/resources/documents/17844641__WMSC_Decision_130907.pdf Seems that it well went quite a way beyond straightforward possession of the document, with use/discussion of the information involved, and de la Rosa and Alonso involved too. The FIA assured the drivers of their immunity - the rationale explained as to why is thin (and wrong) in my book.
So there was a couple of engineers and drivers involved, which may well be the tip of the iceberg, but the FIA have enough for their purpose which is to make an example of the wrongdoers. Guess they have done that, and I'd be surprised if McLaren appeal on the basis that the cars are being allowed to race - that didn't happen to Tyrrell or Toyota.
The whole thing just confirms yet again to me that F1 isn't a sport in the accepted sense any more, and many of the participants aren't true sportsmen. And I really don't give a toss about "its a dog eat dog world at the top" - it's still supposed to be a sport and the advantages should come from finding those little bits of wriggle room within the technical regulations - not by nicking other people's designs.
MG Mark