Yes! You can install and activate any divimode.com plugin on any website. Even on websites that you create or maintain for other people.
You can enter your license key on your own websites, as well as on client websites. This disables the license reminder and unlocks automatic plugin updates.
Can clients re-use my license?
No, it’s not allowed that other people use your license key on projects you are not involved in. Your license key may only be used by yourself.
The license key is never displayed on the website, so your client cannot copy-paste it without your knowledge. However, the key is stored in plain-text in the “options” table of the WordPress database – keep that in mind when sharing database backups!