PS3 Game Sharing & Trophy Related Question?

ok, i recently knew about this game sharing thing and i need a slightly thorough briefing on it. I know FIVE activation is the limit, but does this mean that i can share games for FIVE times of the SAME title or FIVE times for ANY DIFFERENT title (if i have 2 games of different titles that needed sharing can i can share up to FIVE times EACH meaning TEN times ?) Continuing on the briefing, lets say i have 5 user accounts on MY PS3 system ( i know max number of user account on ONE system is 16 ) , does this mean that i have already used up ALL my 5 activation ? It spark me to ask this question because i have 3 user accounts on my PS3, and when i look at the information of the downloaded game (welcome back, infamous) it says it is SHARABLE to the other accounts (ex : shared to acc 2 and acc 3, owner is acc 1). im scared that i have already lost 3 activation .. oh and one more thing. is it possible to SHARE save data files and acquire trophies? lets say if i play infamous on acc 2 using save game file of acc 1, do i get all the trophy of acc 1 or is it blocked [note that this is ALL IN ONE (my) PS3 SYSTEM]. Oh,and what happens if i transfer MY save date file to ANOTHER PS3 system using his/her acc. Do they get all MY acquired trophy ? thx in advance , i hope someone will be able to answer my question.