Dear Maintainer, On Debian Stretch and Buster I'm able to run 'exiv2 rm file.tiff' to remove all metadata from a TIFF file. However, on Debian Bullseye this only removes some metadata, notably the XMP data (the whole '<x:xmpmeta>...' XML stuff) remains in the resulting file. I also tried version 0.27.5-3 from unstable with the same result. If desired I can provide a test file, but it's quite trivial to build one with GIMP and its metadata editor.