Samurai Goomba said:
Ever copy a page out of a library book or textbook? Ever copy most or all of a text? Congrats-you're the literary equivalent of a pirate.
This is 100% legal for the educational purposes, as long as you keep the copies to yourself. It is not piracy.
I agree about copying old games that are no longer being sold or making the intellectual owner money in any other way. Not technically legal, but there is no harm done.
As for trying a (non-shareware) game to see if you like it, before you delete it again, that is the same as regular piracy.
Afteral, you decide how long you "try" the game, without the maker's consent. A day, a month, a year.