Is SafeDisk4 Blocker Safe to Use?

[Lemora]

I haven't been able to find out alot about this program, just that it pulls out reg entries before you play your game, then you click enter and it restores them. Has anyone had problems with it? I'm just nervous because I did install it and I'm okay, but what happens if you forget to hit the enter button? Does anyone know exactly what reg entries it's pulling out? Thanks for any info. Also, it doesn't restore the entry for uninstalling Daemon Tools in Add/Remove Programs and I think that's what has me nervous, like what else is it not restoring?