2022.06.19 10:30 "Re: [Tiff] Copyright and utility of images in documentation", by Greg Troxel
With the conversion to Sphinx, I've copied over the use of all the images on the same documentation pages with the exception of the documentation icons. However, they don't appear to have any particularly obvious connection to the pages they are associated with or any obvious connection to the TIFF file format or library. If the origin and copyrights are unclear, and they don't add any particular value to the documentation, would anyone object to removing them all?
When I saw the subject line, I thought this was going to be a complaint by Debian that they had to either drop the docs or move tiff to non-free. (I don't mean that to sound anti-Debian -- I really respect their commitment to ensuring that all bits are Free.)
Therefore, I think it is best to remove any content without a clear Free Software license, and if removing it doesn't actually hurt, there's no reason to refrain from removal.
There is a small sense of loss of history/tradition, and maybe somebody who knows where these came from will speak up.