I suppose you can find the below mentioned steps useful for retrieving the data from the Norton identity safe in norton internet security 2012.
IDDStore.dat file is the one which holds your Identity Safe data in an encrypted form,
Find the folder in the location below: C:\Documents and Settings\All Users\Application Data\Norton\{random_numbers}\Norton\IdentitySafeDataStore\S-1-5-21-1229272821-484061587-1176238915-1005\
In addition to copying the IDDStore.dat file, you should also copy the other files that reside in the same directory, like IDDStore_bak.dat, *.ico and *.png files (if any). Here are some steps to follow:
1) Turn off Tamper protection. Open the NIS Settings dialog, go to the "Miscellaneous Settings" category, and click the "Norton Product Tamper Protection" slider so it switches off. Set the duration "until system restart".
2) End the process that is holding the file in use. At a command prompt, type the following command: net stop "Norton Internet Security"
3) I'll refer to the folder that contains IDDStore.dat as the "user profile folder". Copy the files from the user profile folder on your backup drive into the user profile folder on the primary drive [C:]
Don't copy the folder itself, just the contents. For example, copy I:\Documents and Settings\All Users\Application Data\Norton\{random_numbers}\Norton\IdentitySafeDataStore\S-1-5-21-1229272821-484061587-1176238915-1005\*,* into C:\Documents and Settings\All Users\Application Data\Norton\{random_numbers}\Norton\IdentitySafeDataStore\S-1-5-21-2052111302-73586283-682013330-500\*.*