Actually, there is not such a protocol yet. I am bother by this.
We are the first in 25 years but, after us, zillions of people
will try to send such message in space, which may become a serious
concern.
They was a proposition made by Douglas Vakoch (U. Vanderbilt) in the last
meeting of the IAA (february 1998).
*No message should offer anything on the behalf of the humankind as a whole
or on behalf of any group.
*No message should make any threat or indicate any hostility toward ETI.
Similarly,
no message should indicate either our subordination to ETI or their
subordination to us.
*The complete content of every message should be entered into an
internationnal archive.
Thsi archive should contain information about signal characteristics, time of
transmission, and target for each transmission, as well as highlighting any
message
content about requested reply message from ETI (eg preferred signal
chracateristics
and time of reply)
*Each message should note that in an attempt to increase intelligibility, a
coherent but
necessarily selective message is been sent. Although this message should be
broadly
representative of a range of human perspectives, it should be explicitely
noted that it
does not envcompass the views of all individuals on earth.
To my knowledge, the proposition is not in application now but they will be
serious
discussion about this at the next meeting. I only recently become aware of
this
proposal. At least, we aplly three of the foor principle. I thought abou
the fourth
one, but the lack of space force us to drop it.
Yvan Dutil