Too bad Manafort and Gates didn't have an account on my unlimited Cloud Platform. They could've created an account, uploaded the .pdf, converted it to .doc, edited it online, and then converted it back to .pdf without being tracked. The only evidence would have been user-specific log files showing which user changed which filenames and when, but all those content changes would have been lost provided they delete the originals.

Hindsight is always 20/20 I guess.