Since my course is about Express, I want to use Express's logo as a part of my course's cover. Express's logo is licensed under CC-BY-SA, so this is where I am getting confused. According to this answer:
I photoshop the image first. What now?
I can only publish the modified image under CC-BY-SA. This means attributing the original source, stating my changes, and mentioning the license. This still doesn't affect the blog post.
Does that mean that my course should be licensed under the terms of CC-BY-SA as well? I am launching it on a platform which is used to make a profit (commercial use), and I can't license it under CC-BY-SA. In another place, it says:
Can I publish an app that uses CC-BY-SA licensed background images?
This is OK as long as I provide proper attribution. Note that attribution should also include a link to the original work, so that users can download this image. I may not apply any (legal or technical) restrictions that would prevent users from exercising their rights under the CC-BY-SA with respect to the background image. But the license of the app is not affected.
As I said, it's only a part of my cover, but I combined it with other image. Does that mean I edited the image? I haven't changed any element of the logo.
So, if I use a logo licensed as CC-BY-SA as a part of my course cover, must the whole course be licensed under CC-BY-SA as well?