While I was going through the source code, I noticed that the source code for ThumbDBLib.dll is not included.
After some googling Ireached:
Looking at the source code vs the ThumbDLLib.dll content on flickrsync, I think flickrsync's ThumbDBLib.dll is based on that source code. I'm not sure however, if the version is the same.
@geada, is this the right source code? Checking 'Properties/Details' on ThumbDBLib.dll provides a version number of 1.0.2302.22260, but I couldn't correlate that to any version number on the ThumbDBLib source code above.