<human>: My friend runs a little web blog that has some personal musings but is mostly an aggregate of stories from other nerdy places on the web. 

Last night he was in a panic because he got a letter from a law firm stating that he had posted copyrighted photographs. And that it was not good enough that he just remove them-- they want him to remove them and then contact them for a "retroactive license" to the photographs .

What he did was basically link to a video on you tube with a cute animal that had been being passed all over the place (facebook, buzzfeed, etc) and then wrote an article with his feelings on the video and included an accompanying picture reiterating his point (the same picture that had being passed around facebook, etc.)

He's concerned because he registered the website in his own name (which they spelled wrong in this demand letter) and he doesn't want to lose his house or something serious over this shit. But I feel like it is a total shakedown. In fact, googling said lawfirm it seems like they send out thousands of these letters every month and people have posted that they "pay them 500 dollars just to make them go away."

He's taken down the pictures, the article, the link, the everything.  What should he do now? It isn't a famous animal (not, like, grumpycat) and he actually had some positive interactions over facebook with the family that owned the animal at the time it was going viral (they shared the link to his page and article because they thought it was clever.) 

My friend hasn't used the image for anything that would make him money-- he hasn't made tshirts, claimed to own it,  or anything like that. It was totally a "look at this cool thing" article.

I say he just ignore it. He has anxiety and is worried and I'd like to put him at ease.

Can you condense the text into three sentences or less?
<bot>: Lawyers contact friend about an image on his webpage and want $ for a retroactive license. Are they trolls or should he get a lawyer?