Presentation Skills

Images found online are not necessarily available for use unconditionally. Very frequently, creators sharing their images use licences to define the allowed usage.

Creative Commons Licences

A very easy and effective way of doing so is using the Creative Commons Licences. Every license helps creators retain copyright while allowing others to copy, distribute, and make some uses of their work — at least non-commercially and it also ensures licensors get the credit for their work they deserve.

• Attribution (CC BY)
• Attribution-ShareAlike (CC BY-SA) 
• Αttribution-NoDerivs (CC BY-ND)
• Attribution-NonCommercial (CC BY-NC) 
• Attribution-NonCommercial-ShareAlike (CC BY-NC-SA)
• Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

Public Domain

There are also images online that they are available for use. They are on the Public Domain. This case includes images whose copyright is overdue or no longer valid. Nobody owns the copyright for these images and hence they can be used by everyone and for any reason.

Royalty-Free

There is also the option to purchase images online. The Royalty-Free licence allows the owner to use the purchased image as many times as he/she wishes.

Use of images for educational purposes is free, under the condition to make a reference to the source. Students and teachers can use any image, regardless of its licence when intended for education (projects, teaching, etc).