If you are not online when you uninstall, or you reformat the disk without uninstalling, or something, Securom also has a website form where you can manually revoke an activation.
Larian's previous games are on Good Old Games with no copy protection (and even with the disk versions the last patch for Beyond Divinity removed the copy protection, and Divine Divinity only needs the disk to play a couple cutscene videos).
They did say that eventually the copy protection would be removed from Divinity 2, as well.
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