Encryption netlist compatibility

Hi,

Please can you give me an advice? I have a problem with netlist encryption. In our server we used MMSIM 12.10.347 version, where I encrypt file by spectre_encrypt command. However when our customer try to simulate encrypted file using by MMSIM 11.10.214 version, they get following output report:

FATAL (SFE-79): "/home/mkovac/script_cadence/Encrypter/Encrypt_output/Invertor_ENC.scs" 31: Decryption failed. The reason could be CMI2.0 or earlier version library is loaded or invalid encrypted data.

We used only standard TSMC library.

I also introduce you here the example of source netlist code and encrypted netlist generated in our machine. It is simple PI resistive cell. They got the same already mentioned ERROR output also for this simple passive circuit. The content of original source netlist:

// Library name: Kovi

// Cell name: PassiveNetwork

// View name: schematic

subckt PassiveNetwork in out

    R2 (0 out) resistor r=1K

    R1 (in out) resistor r=1K

    R0 (in 0) resistor r=1K

ends PassiveNetwork

// End of subcircuit definition.

this is encrypted file by MMSIM 12.10.347 version:

// Library name: Kovi

// Cell name: PassiveNetwork

// View name: schematic

//pragma protect begin_protected

//pragma protect data_method   = RC5

//pragma protect data_keyowner = Cadence Design Systems.

//pragma protect data_keyname  = CDS_KEY

//pragma protect data_keyversion = 2

//pragma protect data_block

MSLeSnyRVrmUv5Pc5ZluIMgDV6C1UpjUMGa8zVRZXFwLXdCdydcBNO4ofxxIixt/

49EsBNzgRIhB0d4pd2/+775G/W+79O/ohr582eEGExEzoAKibbhRwi2IzxJ4xP1a

C1gTI6OwOze60OSN9LaNJKXcQW4PdGCGfE3gm77Vs+JK/5xOhwlrbUig/5AHxRPH

DvwSLbNEYbBIPLlFMYU3XseP1u5Jz9x12LkEvWXaH59sIzW9xNYHtcPzP8U5PK8d

jZQLr+GVO2GXH4qjPXu0XZdIbvy2OvLZT1psI3UH9U8nMtVhps4xCvfxP1F1pKJB

KkidLf8f9Sxc1s+nbFTlyTvafBuPGnk9DCPI7VRpfhbIPsadQpKwdnPjY5BCvKxj

//pragma protect end_protected

Some advice? Can be problem in that they dont have licence for encrypting file or there is other hidden problem? Thank you for any reply.