I'll talk about copyright in the US, as I don't know how it's done elsewhere.
But there is one important point to keep in mind:
While your work is protected the moment it's created, you can't really do anything substantial with that protection until you register your work with the Copyright Office by storing a copy at LOC.
Most people really don't realize it, but you can't actually sue anyone until you've filed for a registration.
Let's say you take a picture, post it online, and someone else grabs it and uses it in a poster which they later sell.
You want to sue, right? Great. But federal judges won't accept your complaint unless it's accompanied by a receipt from the Copyright office. That's in addition to proof that the work is yours.
So in order to sue, you would have to register your work even if it's at a later time, long after you've published it.
Let me repeat that again. You are protected the moment you take a picture. But you can't actually exercise that protection until you've registered your work with the Copyright Office.
For some reason, many people have a hard time grasping it. They either think that unless they register they aren't protected, or they think they can sue without registering. Both of those are false assumptions.
Since you have to register your work anyway (to sue), then you might as well register it while it's still unpublished.
Registering unpublished work has one major benefit aside from statutory damages. Registration of unpublished work is in itself proof of your ownership.
If you register your picture on, say, May 1, 2011, and the other party can't prove that they were in the possession of that picture prior to that date, then the judge would side with you. You won't need any additional proof to accompany the registration receipt.
So if you register your unpublished work, you can safely spread around not just thumbnails, but even original RAW files and not care about them being stolen. (As a matter of fact, you might hope they would get stolen and used by someone, preferably in a commercial way for a large company.)
I haven't filed any registrations in a long time, and when I did, I did it using postal service. But it is my understanding that the Copyright office accepts online registrations, and you can register thousands of images at once. So it's not that expensive.
This is the right way to deal with copyright. Now, let's briefly talk about the wrong way.
Embedding watermarks, EXIF data, printing and mailing envelopes to yourself via certified mail, getting affidavits from relatives, Flickr timestamps, etc. won't help you get your case accepted by a judge. It will be thrown out.
All of those things are nothing more than supporting evidence of your claim that the image is yours. And you will need them only if you register your work as published work at a later time just so that you can proceed with a lawsuit. But if you register your unpublished work, that's your evidence. And it is the strongest evidence a court would consider.
Additionally, if you don't register your work, but post it online, and later decide to sue someone over using it, then the most you could hope for is actual damages. And the burden of proving the amount would be on you. And the attorney fees aren't likely to be awarded. And... well it's as if you didn't really have any copyright protection at all.
Do you know why the cases where photographers get large compensations (with unregistered works) are so widely discussed? That's because they are so rare. Most of the time, authors/photographers don't get anything. And all their watermarks and EXIF data, and whatever else aren't of any help.
So in the context of forums and photography, if you post something that you've already registered with the Copyright office, then you don't need to worry about anyone stealing your pictures. Be glad if they do. But if you didn't register, then you aren't losing anything because, frankly, you didn't have anything to begin with.
I know this is a downer, but that's the reality. Not many people (especially forum owners, especially in the photography niche) would lay it out like that, but that's the honest truth of how things are.
My personal take on this is not to bother with registrations. I simply post my photos. If something gets stolen, I'll be sad about that person/company ripping me off. But that's life.
So everyone needs to make a personal decision whether to register or not. Stick with it. And based on that decision, maintain the attitude towards image theft or even the forum posts.
I'll talk about copyright in the US, as I don't kn... (
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