Thing 11: Copyright

I love the Creative Commons Search Tool – It’s on my browser tool bar and is my go to choice for image searching. When I’m putting together presentations, I either use my own photographs, so I have the copyright, or images I’ve sourced from here with appropriate CC licences.

I recently put together a presentation to be delivered on Halloween – and these are a couple of my favorite images from that:


Jack-o’-lanterns William Warby CC BY 2.0


Mary Ellen Page’s Halloween Town 2009 by Kevin Dooley CC BY 2.0

Ideally I look for images with a CC BY licence. I do sometimes use other images with licences but I’m a bit confused by the Share Alike aspect  CC BY-NC-SA 2.0 as this says:

ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

Usually I’m collecting images to illustrate a presentation, and even if I share this round afterwards I don’t add a CC licence. Maybe I should be doing this? Or maybe if I’ve used a SA licence for one of the images I’ve included then it’s implied? I’d appreciate any advice on this?