Some old posts here explain this - try the search.
Basically they are pic & eeprom files for a "silver" card or "piccard2/pic2"card, being based on the 16F876/7 PIC and 24c64/5 eeprom.
They are not the only files that are used with those cards, but they are the ones that give you multi-encryption access (4-in1, 5-in-1, 6-in-1).
So with such files, you can get channels encrypTed under Irdeto1, Betacrypt1, Viaccess1, Mediaguard1 ("seca1"), Nagravision and TPScrypt. Assuming - that is - that the eeprom is programmed with the correct keys for the respective providers. And assuming the card is used in a suitable receiver or CI CAM (which more often than not also require to be patched in some way to enable that particular set of features).
2old