Worst still if they have installed your cctv system they will more than likely try to keep the admin account as theirs as it is a real pain when the admin password is lost. Hence the reason the admin account/rights is not given to the customer.
The admin account always has remote access rights so this means that the installer can log in anytime 24/7 and access your cctv either live view or playback.
As most security products are cheap and getting cheaper the profit margins are reducing all the time. The results in lower and lower quality employees personnel being employed.
You MUST be very very careful when selecting a ‘security’ installer.