Makes local copies of all the linked images in a post, adding them as gallery attachments.
The plugin examines the HTML source of your post when you save it, inspecting each IMG tag, and processing them according to the options you have selected.
Under the default settings, it will find IMG tags with links to images on other web sites and copy those images to your web site, updating the IMG src to point to your copy.
I built this plugin for the purpose on one-click publishing of my photoblog. I publish my own photos (to which I have all rights) to Flickr, and then my plugin copies the file from Flickr's server to my own web server.
Yes, there are numerous was that this plugin could be used unethically, but there are just as many perfectly reasonable uses for it. I leave it to you to make the right decision.