A quick definition of commencement of infringement:

Commencement of infringement is the first time someone does something that breaks the rules of copyright, patent, or trademark ownership. For example, if someone starts selling items that infringe on someone else's copyright, that is the commencement of infringement. Infringement is when someone interferes with the exclusive rights of the owner of intellectual property, like copying or distributing their work without permission. There are different types of infringement, like direct infringement when someone copies or displays a copyrighted work without permission, or contributory infringement when someone helps someone else infringe on intellectual property. Willful infringement is when someone intentionally breaks the rules, while innocent infringement is when someone does it without knowing it's wrong.