The exercises on Linear Algebra are created by Delft University of Technology. All of these materials are available under an open Creative Commons license.
A big thanks to Delft University of Technology for sharing these exercise with the rest of the world via Grasple! Please provide any feedback on the exercises via the "suggest improvement" options available within Grasple.
Want to know why and how they did publish these exercises under an open license? Read our blog "TUDelft releases 535 open exercises on Linear Algebra!"