I have often used images on presentations (goes back to college days). Often I have used images from the net for the last 4-5 years. Sometimes I’ve used images to convey a meaning better and sometimes I’ve used them just to make the presentation look better. The use of these presentations have been for educational and business purposes.
Have I unknowingly committed copyright infringement here ? Also, is scanning a part or a book for inclusion into a presentation or a report, a copyright infringement ? Specifically some graphs or plots from a book which are very difficult to draw.
IANA lawyer, but I think the answer depends partly on what you do professionally, who your audience is, and how (or if) money enters the situation.
Are you a professional lecturer/presenter? Then yes. Are you presenting presentations to your family about how to manage the family budget? Then no. There are about a million variations which would determine the answer in your case.
you should be alright under the the Fair Use Rule of the United States Copyright Act of 1976, but i am not sure if it protects you if you used the entire strip.
Quantity - is it just a couple strips in a whole lecture? Or is there one per page?
Money - are you being paid to do the presentation?
If the answer to 1 is “just 1 or 2” and the answer to 2 is “no”, most likely you fall under Fair Use. However - Fair Use limits are a tricky thing, and interpretations do vary somewhat.
