yes, you have rights to get NOC from second or 3rd forth fifth company ....in qatar law ....your first company has athority to give you noc or not its over to company but when you got NOC from first company you are now local person so, any company you will join after if you dont like that company you can ask for NOC...if company is not giving you NOC. So you have to go labour department insha allah you will get NOC and company has to face fine of 40000 QR