I used some screenshots from academic published papers (e.g. figures) in my presentation that I gave to a group of colleagues. The screenshots were used as examples of how you should or should not do certain analyses or present certain results.
As my examples concerned screenshots of figures or tables from published paper these fall under copyright. The copyright is usually held by the editors/publishing companies. The papers/sources are correctly referenced on the respective slide of my presentation that contain the screenshots.
Still my question is whether it is legal to publish (e.g. make online available) the slides on which the screenshots are given or would this infringe copyright? In other words: do I have to delete the respective slides before spreading my talk?