A brief summary:
Most probably the file encoding components of TTS:
- Name / file number (four bytes), if change name/numer the file not played on TV,
- KEY generated by the TV (do not know what length), KEY is in EEPROM.
Are not valid in the encoding:
- Files AID, VID, DAT, and others.
You can copy files DATA, AID, VID, TTS on your computer and then you can format the HDD again several times and record them on the HDD TV and watch them.
Full summary in Polish here:
Panasonic Viera i zdekodowanie/odszyfrowanie nagra