I work for this software vendor that sells photo editing tools. This is a bit of 101 question, but I did not find similar one on "Common Question".
Is there any legal restriction regarding how much you can edit and use these stock photo? In my case, I would like to take some vector image icons, change colors and maybe shapes, and use them as diagram on technical article just like this Adobe's white paper.
You can read the license agreement here to see where your project falls under.
A good general rule of thumb is that the images can be used 'as part of a project' but not 'as the project itself'. If you are using the images in a product documentation you should be fine based on the info you provided. You can edit the images as much as you like.
Making a photo book of images licensed and selling the book with the images as the actual content is bad. Very bad.
Making documentation for a product and using the images to demonstrate with in the document where the image is not part of the actual product is usually fine.
Thank you for such a quick response Brad! I read through Section 3, and the restrictions seem to be for mal-intended uses like you said.