There are several ways to obtain an ACDSee Pro 3 license key:
A quick Google search for "ACDSee Pro 3 license key" will likely lead you to "keygen" sites, crack forums, or pages offering free activation codes. acdsee pro 3 license key
Search your inbox for "ACDSee license" or "ACDSee activation" to find the original receipt sent during purchase. There are several ways to obtain an ACDSee