So I finally got one of these horrible letters. Turns out it was objecting to an image in a post more than 6 years old. I'm in the early stages of dealing with this so wish me luck.
Anyway, god only knows how many more of these old images might be lurking on my site with over 20,000 blog posts from the past 10 years. We've been really strict about creative commons in the past 5-6 years but there are probably some outliers from the old days that need to be dealt with.
So my question: Does anyone know of a service like TinEye that can scan my entire site for likely offenders? I might even pay for this to cleanse my site of images that might invite future harassment.