AFAIK there are 2 checks
A local blacklist
and a remote account check
The local blacklist was cracked by Dr.XJ.
Your username and serial are checked first in the local blocklist. If it caught you, a prompt asking for a username and serial appears. This was cracked however it didnt stop the application from making a http request to dvbviewer.com. After it caught you, video feed would stop and you will get a no hardware found error.
1. Disconnect from the internet (long winded but it works)
2. Block it using your firewall
3. (if you dont use a firewall) add
If you had previously accessed the internet and your blacklisted serial was caught, you must reinstall DVBViewer, crack and block it before using it.
The http request may either provide an updated blacklist or provide remote checking, either case once its blocked it works.
Setup.exe serial authorisation may again just check against a local blacklist since DR.XJ's serial works in setup but gets caught once online.
That was fun.