So VAC was enabled last update?
VAC is enabled yet before master made his changes, so depending on VAC itself it could be 2 late for those who used it
This is wrong, you forget about BO2. I'm still in good stand on steam but i'm banned from BO2...
Even it will 64bit VAC need source code from Activision to do something, this is for DMR. Seam to me that something is changed betwen steam and activision, steam is still the most secure DRM manager for PC user but Activision look like no matter this, console are more protected from unauthorized online play (see Mw2chaos, alterOps, TeknoMw3 or last loader for BO2 that can use steam functional to find player).
About master Esp all we know it from past CoD, untill it was named Sph4k, some1 claimed it was banned for it some1 not, personly i wasn't banned for it with BO.
And all raccomend to rename DLL or EXE by your own to prevent detection
Even it will 64bit VAC need source code from Activision to do something, this is for DMR. Seam to me that something is changed betwen steam and activision, steam is still the most secure DRM manager for PC user but Activision look like no matter this, console are more protected from unauthorized online play (see Mw2chaos, alterOps, TeknoMw3 or last loader for BO2 that can use steam functional to find player).
About master Esp all we know it from past CoD, untill it was named Sph4k, some1 claimed it was banned for it some1 not, personly i wasn't banned for it with BO.
And all raccomend to rename DLL or EXE by your own to prevent detection
just renaming the exe or whatever isn't a 100% prevention but do whatever makes you feel more secure 

The VAC is in full effect. I cannot connect now. 
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In the config file you could let it make random/custom (Executable) names. 