Glossmarks
Glossmarks are another technology that I promised to blog upon in this recent post - this is a way of adjusting (again) toner distribution and orientation on paper to give different levels of gloss on an image, and embed a watermark. Glossmarks, just like IR marks, UV fluorescence, or microprint, use standard devices, standard paper, and standard toners - the “effect” is created owing to special software, with a watermark which is produced digitally. A difference with the other technologies though is that this security measure is visible without any special equipment – in fact, it gives this cool “holographic” effect to the image, which makes the watermark appear under light at certain angles.
This adds to the portfolio of technologies that are available to secure the paper document - besides adding this “cool effect” to your customer documents, this is a very efficient watermarking system to prevent the copy of documents (or differentiate copies from originals).

[...] technologies that can secure the paper output, such as the Xerox ones I blogged upon earlier: Glossmarks, Correlation Marks, UV marks, IR marks, or microprinting, or some that the article alluded to: [...]