[tsjq]

does this work to stop others from using your photos? and: do you need to do this signed-pdf procedure for each photo that you upload to FB ?

[amingilani]

I can't recall the exact procedure. I did write an article that I haven't published, if I can find it. I'll post it to HN. But I think I reported several URLs in my initial report, and they were all handled. The problem didn't crop up again, and so I didn't need to file an additional DMCA.

If I had to, however, I'd used the same signed PDF as proof of ownership.