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First off yes it is illegal to vent off any a/c system to atmosphere (but it is OK for the refrigerant to slowly leak out of a system), also in case you are wondering the Montreal Protocol is the international agreement that phased out ozone depleting refrigerants (r-12) and prompted the govt to pass legislation on the use of CFC's and HCFC's.
If your a/c system has slowly lost its charge over the years you are safe to use a recharge kit that you can buy off the shelf just make sure it has the oil mixed in with it and it has a pressure gauge attached to it so you get the correct charge in the system.
If the system lost its charge all of a sudden then you will need to have a shop repair the system. Also if the system has been opened you will need to have a shop purge the air out of the system and refill.
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