File locking is a feature of Subversion which can be used to optionally "lock" a file that you are working on so that others cannot commit changes to it. This feature is not usually used for source code because changes to source code files can usually be merged fairly easily. File locking becomes useful when you are working with files that are not trivially mergeable.
Shiny Moose Software started as a fairly small team, and originally used the dreaded "programmer art" (placeholder graphics created by a developer rather than an artist) while working on their MooseHiragana application. Now that the application is almost finished, Quinn has decided that the graphics created by Mowbray aren't good enough, so they've hired an artist, Mariah, to create some better graphics.
Mariah checks out the images directory to take a look at the images created by Mowbray. While she's working on re-creating the images, Mowbray notices that he has made a mistake. The image file for the character...