I noticed a thing that looks to me as a license infringement. I'll post it here to raise the issue, as I'm not 100% sure.
The doubt that I have is on Popcorn Maker.
Popcorn Maker is "a creative tool that makes authoring interactive media pages as easy as point and click". Practically it is like a video editor, that kind of tool that allows to mix several videos and to mix audio and music. The results is not (only) a video, but an html page with the video and other "enhancements", like related web pager, images or MAPS.
Choose for example the "simple" template. From time 00:00:03 (i.e: three seconds) to time 00:00:05 you'll see on the upper right part of the screen a Stamen map.
On the lower left part of the map you'll find.... the Google logo.
On the lower right part of the map you'll find.... the Google maps terms and conditions.
If you have doubts on the Stamen map, check the timeline (the lower part of the screen, in black). Each thing on the screen beyond the video appears as a block. The maps blocks are called "googlemap" blocks.
If you double click on the right block (the one from 00:00:03 to 00:00:05) you will find out that the "Map Mode" field is set to "Stamen Water colour" (and you can also select Stamen Toner).
In the example output the left of the timeline you will find a Stamen map again with Google logo and term and conditions link.
You will see also that the "Address" field is set to "alaska" followed by the notice "powered by Google". That could be actually true, maybe the use the Google API to identify the coordinates.
On the Stamen website you can read "If you use the tiles we host here, please use this attribution: Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under CC BY SA." It seems to me that the attribution is missing...............
Maybe someone should contact the developers of Popcorn Maker.