General Tag Discussion

Background Pony #52BA
Any idea what’s up with the tag acdsee? I know it’s a piece of software. All instances of the tag were added, none were there on upload; only one user has added them (except the first 3 were by a BP). What really perplexes me are
  1. what even is significant at all about that software? AFAIK it’s not known for drawing, like say, medibang paint
  2. I don’t even see anything at the sources identifying that software was used, is it in the file metadata or something? How would they have been able to tell?
[edit] adobe imageready and photoshop elements too, while I’m asking…
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