IMO, Siliconoptix has done a very clear and comprehensive job of stating their position on
others using the content of
their website. Their "copyright statement" is easily readable, but lengthy. Below is the introductory sentence and the website link so that anyone wishing to read the full document may locate it.
"Silicon Optix Copyright Statement
All editorial content and graphics on this site are protected by U.S. copyright and international treaties and may not be copied without the express written permission of Silicon Optix Inc. (SiOptix), which reserves all rights. ......"
http://www.siliconoptix.com/copyright.cfm
Based on the foregoing, I would be surprised if Silicon Optix (and their attorneys) would be happy with unattributed plagiarizing of their material.
There is a huge difference between appropriately using material someone else created, and plagiarizing. Where would the folks who write press releases be if nobody ever redistributed them, syndicated newspaper columnists would be out of a job if newspapers would not print the columns. My point is that many websites including CDRabs use material from others. We as customers should expect them to follow the rules of the copyright owner.
Ian, thanks for pointing out instances which appear to you to be possible inappropriate use. I personally don't wish to support venues that repeatedly engage in copyright abuse.