My question was put on hold for the following reason:
The answer to this question strongly depends on individual factors such as a certain person’s preferences, a given institution’s regulations, the exact contents of your work or your personal values. Thus only someone familiar can answer th...
@gerrit I did that too today. I first went to a room to find nothing. So I checked the room again, without noticing that the day was wrong. Only when I got to the potentially right room, I checked also the day to discover that it was the wrong day. Oh, well.
A colleague was unable to publish some of his results because of corporate secrets (essentially the results indicated which parts of town were going to be worst affected by mining deformations, and if public those results would fuel real estate speculation)
@NickAlexeev For example, according to this source (citefast.com/styleguide.php?style=APA&sec=Thesis), it seems that for the APA style an unpublished thesis is one that is not available through commercial databases or institutional repositories.
@MassimoOrtolano I'm trying to invent an example. Proprietary information was used in a thesis. The thesis was defended in private (say, everyone on the defense committee have signed an NDA). The thesis is not readily available to the public at the library of the institution (university). The thesis is archived somewhere, perhaps there is limited access to it (perhaps an NDA is required).
@NickAlexeev I think even if the defense was public and the thesis is readily available in the library (and possibly on-line) some people would still say it is unpublished.
@NickAlexeev It might not involve necessarily proprietary information. For instance, my thesis is written in Italian and at that time there was no institutional repository like now. Like any thesis in Italy it's deposited in the national library in Rome, but to access it you have to go there according to the library website. For an international audience, for all practical purposes, I'd call my thesis "unpublished".