Javi,
I tend to believe it is caused by cadence version you are running.
versions 443 and lower were using lic# 312 for drc while from 445 up it is lic 7111x
Check what version you are running!!!!!
To get rid of the problem try
1) Use the latest(e.g 4.4.3.100.153) ISR for 4.4.3. The older diva binaries were upgraded to recognize the new keys.
OR
2) Keep the old 3xx (312, 314 etc) feature lines from the old license file before installing
the 4.4.5 license file.
I would also recommend to contact Cadence.....