Yesterday on another photo site, someone posted a thread with a question, something like was the streak or unevenness in the sky caused by developing the negative or scanning the image?, and posted a link to a site displaying the photographers work. The photographer who made the image responded (it was the scanner, not the development), and then proceeded to flame the poster for publishing the link without the photographers permission, stating it was an infringement of copyright, and illegal. Quite a few posts followed which were in agreement with the photographer. On this very site, almost every day, I see threads in which the poster adds a link to another photographers work, or site. No flame wars erupt, nor is anyone accused of copyright violation, as far as I can tell. So Im confused. I copied the thread (before it was deleted) and asked my sister, a patent lawyer who specializes in intellectual property. She opined that it was legal. But I dont want to debate legalitythats what the courtroom is for. I do want to avoid unknowingly violating some ethical standard when I post. So Im asking the wise folks of this forum to enlighten me, and others, as to any unwritten rules, or ethical standards, for posting a link to another photographers work or site. Im not talking about defaming someone, but just posting an informational link.