how do you keep your photos from being used by unauthorised people?
That depends on what do you define as 'unauthorized' and in which context. Easiest way: offline Everything else needs to be defined in the context. Are you talking about online galleries? Or stock photos? Or submitting pictures for print service? Please be a bit more specific.
Generally... try not to post your pictures online.
And if you do, restrict the size available and use watermarks on the picture.
haha, the purpose i wrote here is definitely means you are going to share it online but how do you protect it from theft.
thanks night86mare for the link.
ok, i been hearing alot about watermarketing, but y not consider invisible watermarking? Basically it is to send your photo to be process and embed an unique digital signature into every copy of your photo before you start sharing it. I am thinking, what if there is a service that helps you do that and it will help you check on the internet for duplicate copies and report the link to you.
I wonder if that will be a business
if you post maybe 650 pixels longest edge, there isn't going to be much money they will gain from it.
that said, people sometimes do funny things rather than gaining money. even with a watermark, your photos still can be leeched and be claimed to be taken by someone else. it has happened to a few people here before.
some many people chose to
not to post
post a low res
Another option is to restrict your audience via private albums.