SRS, the long-ago rule was against posting more than one screenful of information, because there were a couple of people who were dominating threads by throwing lengthy copy-pastes back and forth at each other and leaving no room for actual human discussion. The information should be credited to the source, but we've never prohibited posting copy-pasted information in the forum. We've generally encouraged people to post factual information in its entirety, not just a link.
And this is a downright interesting article, and should be posted in its entirety.
We've rarely had a question about copyright infringement, but we do take things down if the copyright holder asks us to.
-Joe-