Heat pump the brand name Freon, a trademark of DuPont. Its manufacture is now banned or severely restricted by the Montreal Protocol of August 1987 because of the damage that CFCs cause to the ozone layer if released into the atmosphere. One widely adopted replacement refrigerant is the hydrofluorocarbon (HFC) known as R-134a (1,1,1,2-tetrafluoroethane). Heat pumps using R-134a replaced R-12 (dichlorodifluoromethane) and have similar thermodynamic properties but with insignificant ozone depletion potential and a somewhat lower global warming potential. Other substances such as liquid R-717 ammonia are widely used in large-scale systems, or occasionally the less corrosive but more flammable propane or
Encrypted Title Key normal result of updating a recordable MKB shall also use these same protocols. These protocols are: - Recovery Protocol When the Encrypted Title Keys are in a Separate File: In this case, the original recording device shall rename the old encrypted Title Keys to a defined temporary name before beginning to write the new encrypted Title Key File. -Recovery Protocol When the Encrypted Title Keys are in the Content File: In the extreme case, each content file contains its own encrypted Title Key. In that case, it is not likely that there is a temporary version of the encrypted Title