The purpose of copyright terms is often to prevent those who have not licensed the images from using them.
Can I Use Copyrighted Images?
Your images must be uploaded to the A2Z Puzzler server in order to create printables with them. Does this violate copyright?
If you have a +Plus subscription you can make the word list only available to you, so others cannot access it an use the pictures to create their own puzzles. The pictures have to be on our server so the cards can be created though. By default, the printed output is copy protected so that the images cannot be copied out of them.
For much purchased clipart this will be sufficient to not violate the copyright, since you will be the only one able to use the pictures. But you will need to check the sites you are purchasing the clipart and images from to verify that.