Not sure about terminology, but it seems that what is stored in dm_docbase_config.i_crypto_key is a DBK, and what is stored in dm_docbase_config.i_ticket_crypto_key is a LTK:
[dmadmin@docu72dev01 bin]$ strings -a documentum | grep _KEY_CLASS DM_DBK_KEY_CLASS DM_LTK_KEY_CLASS DM_FSK_KEY_CLASS DM_PPK_KEY_CLASS ...
The next challenges are:
- Install TCS option and understand storage key structure
- Create offline tool generating login tickets
AEK and DBK parsers are already done: https://github.com/andreybpanfilov/prodctm/tree/master/prodctm-util/src/main/java/pro/documentum/util/crypto