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Polaroid applied for a design mark apparently covering the shape of their prints, but that application was abandoned in 2000. That shape is distinctive, but, for example, Fujifilm Instax looks similar — not to mention Impossible Project film, which is actually made in a former Polaroid factory. You're not using the Polaroid name, which does have a valid ...
A piece of photo paper X x Y millimeters with uneven margins cannot be trademarked. Do not mention the word "Polaroid" in print anywhere, do not use the company logo, and don't bother printing the black square on the back of the picture and you'll be fine.
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