Am I able to publish to the web PowerPoint presentations where a number of the slides might contain images for which the presenters do not hold copyright?
The simple answer is that if the images are still in copyright, then you will need to obtain the permission of the copyright holder to reproduce the images on the website. This is because communicating a copyright protected work to the public by electronic means is an infringement of a copyright owner’s rights. Moreover, before you include any image in web a page, in handouts, or as part of a PowerPoint presentation, you must have the permission of the rights owner unless you know the image is out of copyright or covered for digital use by a licence held by the relevant organisation. You should also note that copyright in artistic works lasts until 70 years after the death of the artist/photographer. However, even if the copyright has expired you should consider whether there may be other legal protection preventing you from making use of the work (for example an original image might have been ‘enhanced’ by a third party and that third party might claim ‘copyright’ for their ‘artistic’
