Many were outraged when Darrell Whitelaw tweeted a picture of Dropbox denying his ability to share a folder due to a DMCA (Digital Millennium Copyright Act) takedown request. Whitelaw later admitted that he was indeed trying to share a copyrighted video with a public link. Dropbox has explained to Ars Technica that it does not scan private documents, nor did it remove the file from Whitelaw’s account, but it does compare hashes of publicly shared files against the hashes of files that have already been served a notice. The DMCA requires companies like Dropbox to take measures to ensure that copyrighted material is not shared after a takedown notice has been issued. Whitelaw himself told Ars, “They’re just following the laws laid out for them. Was just surprised to see it.” follow link
Copy Disk Image as Folder
When you open a .dmg file, a disk image is mounted. You are then generally supposed to copy the contents of that disk image to your hard drive (to your Desktop, your Applications folder, or wherever). But what if you want to copy the whole disk image, including all its contents, as a folder? Hold the Option key, and drag the "proxy icon" in the title bar of the disk image window to the destination in the Finder.
Dropbox Explains Policy on DMCA Reviews