It is better to have the chip professionally installed,
but you can install it yourself. Read the directions at
www.rotc.com/psx/
www.rotc.com/psx/
Because they also make money with it because
every one wants imported games now days. So
they loose some gain more.
Sony produces the chip them selves.
It is called a MOD chip. It was origanally
made to allow people to play imported games,
but then some one found out that it can be used
to play copied games.
Yes it is legal to buy and install the chip, as well
as, to play imported games with it. However, it
is not legal to use it to play copied or backed up
games.