EA update ???

[EttoreW]

if I have an EA in .ex4, without the code, it is possibile to preserve it from any future modification of the code performed by the author? How?

[Samuel Akinbowale]

        have you consider an expiry time

[EttoreW]

No, does all EA have one? How can i verify that?

[William Roeder]

EttoreW: if I have an EA in .ex4, without the code, it is possibile to preserve it from any future modification of the code performed by the author? How?

You have the EA. Don't accept updates from the author. Open <datafolder>\MQL4\Experts and set it to read-only to be sure.