Metadata is something that is used today in many areas, from computer forensics to corporate espionage. I will give you a regular example first. As a professor, there are times when I think something might be an exact copy of someone else’s file. The first thing I will do is take a look at the file properties. In Office 2010, I would go to the File tab and select “Info”. On the right side are properties. I can see very easily the name of the person who created the file. In a computer lab, most people probably have the same user name, so that may not tell me anything. However, if you created it at home and gave it to a friend, there is pretty damning evidence since your friend has handed in a file with your name in it. Other ways include “date created” – this tells me the day and time the file was created. I am of course not opening up my whole bag of tricks here, but these are two ways to investigate a file further.
In terms of corporate espionage and hacking…many times, the metadata in programs such as Word (and most of the rest of Office) includes data like username, company name and a file path. If this file was created on a network drive, I now know the name of one of your company’s internal servers and possibly your username. This information is valuable for hackers!
If you are distributing a file from Office, also be aware if your company uses tracking changes, revisions, comments, or hidden text, that information can be included in a file you distribute. If a member of a company’s staff left a comment in the file, there is a good chance it could be found. You can use the Office 2010 Prepare for Sharing options to minimize this risk, though once again, most people do not realize this.
via Interesting Computer Stuff with Professor Cameron: Metadata and You.