One of the tricks in production of litigation documents is to produce them in the least convenient form that conforms to the rules. So if the opposing side requests a bunch of e-mails and Word documents, and they don't have the foresight to request them in native format with metadata intact (or the rules don't require you to send them that way), you send them a stack of CDs full of TIFFs. There are even programs that will load up all the documents for review by the baby attorneys* and then convert them all to TIFFs for production. And when the other side sends you a bunch of TIFFs on CDs, it will load those all up, OCR them, and tag them with keywords. This is in part why production is so ridiculously expensive. (The other reason is that the attorneys will spend half a million dollars filing motions and counter-motions fighting over the search terms to use on document and e-mail searches.) (This is why attorneys always win lawsuits, as long as the client is solvent. Occasionally, one of the clients wins too.)
*If you retain a big law firm, they will still bill you $300/hr. for the baby attorney to sit in front of his computer all day, flipping through documents looking for stuff that should be tagged as "hot" or "damaging" or whatever before they go out. Then when the opposing side sends their production, baby attorney sits and reviews all of those too. The whole time, baby attorney is thinking, "I got seven years of post-secondary education for THIS?" But he'll do it, because the partner told him to, and they're paying him a salary of $160,000 plus bonuses that depend on billable hours, and as mind-numbingly boring as it is, it is the easiest way on earth to rack up billable hours, and he still has $200,000 in student loans to pay off.