Every usage of an Serial Number, Activation Key or any other connection to the Activation Server 5 (like move a license) creates a record in the database - this is a Transaction.
Even if the request fails, an error is recorded.
There could be more than one Transaction for a key / ID.
•A user reinstalls the software and uses the Activation Key again. If this reinstallation is working or would create an error is defined in the product reactivation settings
•Validate a key / ID
•A license is moved from PC A to PC B
•A key, which was already used on PC A is also used on PC B. If this additional usage of a key is working or would create an error is defined in the Maximum Key / ID usage settings
•A regular online check, e.g. license check every 30 days
•A license transfer
•A license file upload or download
A transaction is also counted for validations which result in an error like
•Key / ID is locked
•Key / ID already used
•Transaction failed, because of an abusive usage