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
Two Shortcuts for App Exposé
If you want to see all the windows for a particular app via App Exposé, there are two hidden shortcuts. For either, start by pressing Command-Tab to bring up the app switcher. Then, while still holding down the Command key, press either the 1 key or the up arrow. That puts you into App Expose mode, with all of an app's windows showing, and recent documents in a row across the bottom of the screen. Let up on the Command key, and then you can press Tab to cycle through all the running apps.
Dropbox Explains Policy on DMCA Reviews