|Quoting PHX787 (Reply 1):|
The only time this becomes a legal copyright issue is if the user makes an effort to mask the watermark/tagline and/or uploading the photo, WHILE claiming (despite both) that the photo is their own.
That's not quite correct. If it has been reproduced, e.g. by downloading and re-uploading onto another site, then there is a prima facie case of copyright violation.
|Quoting gonzalu (Reply 3):|
Our copyright here on A.net clearly states MUST NOT BE USED IN ANY WAY without prior permission.
The terms and conditions state:
You have limited rights to personally view the images with your web browser and to use them as your personal computer wallpaper (or background image) on your own computer.
So according to airliners.net's usage requirements, downloading them as a computer wallpaper is not against the rules, but aside from that, yes, you're quite right, uploading them onto a site such as Facebook, whether or not the copyright line has been removed, is a breach of copyright.
The only "safe" way is to post a link to the image (in the same way that Airliners.net's own Facebook page does). That way, as the image is not reproduced, it is not considered a violation.