Modern versions of CW Skimmer include online license validation. When you enter a registration key, the software may phone home. If the key is leaked, stolen, or widely distributed, it gets blacklisted. You’ll be left with a “Registration Invalid” message and no recourse.
A single registration key typically covers both CW Skimmer and its server-based counterpart, SkimSrv . To activate the server, you must enter the key into the CW Skimmer application first, then close it and run SkimSrv. cw skimmer registration key