The version of ImageGrab downloadable on this site is reserved for the personal and family use of the video hobbyist. Any use in a commercial, professional, administrative or even associative context is prohibited with this version.
If you need ImageGrab for such use, you should request a Pro version : it is exactly the same version as the personal version, except that it is specially recompiled to remove warnings reminding you that it is for personal use only, and display the name of the company, organization or person who owns an unrestricted Pro license.