I wanted to test fspot, so imported my photo library - I did not make a copy as there are 20GB of files.  I left the flag on to "store info in file" or something like that, because I want the tags to be in the image, when I add them.

On import, fspot stuck a little comment into every image with the fspot version number without warning me.  I understand that I told it to make changes in the file, but I assume that I would have to initiate the change (by adding a tag, or changing a comment).  I do not expect the import process to change my images.