AP StyleGuard is an automated style-checking tool for Microsoft Word or Outlook, developed by Tansa in collaboration with The Associated Press.
Each AP StyleGuard subscription is for a single-user license. Each user needs their own license.
Each user is allowed to activate on more than one machine for their own use (such as home and office). Each of those machines should belong to that subscriber, not to multiple users.
If you purchased a bundle of subscriptions for several users in your organization, you are welcome to transfer a license to a different user, if you have employees come and go or realize that someone else would use it more. In that case, the original user will no longer use the subscription and the new user will take over the activation code.