Sure not, what should someone do with such Code, it's available all over the Web anyway.
And as long as it is NOT editable, from the Outside at least, it cannot be harmed either.
Strictly technically, one could code a Page, to make it's 'static' Source unreadable and even unusable
after downloading such PAGES, or if one tries to start/execute such a File again on a PC, as you
can see here, I was forced once to secure my Pages from just beeing copied as whole and so easy
But it helped, at least for Newbies
But this would not work well in a Shop Envirorment, in some parts at least, where Users have to enter Data,
in order to buy something. And it's a timeconsuming task also, if every single page would have to be re-coded,
before beeing released to the Visitor !