Originally Posted by DemonHades
This wont work for 2 reasons:
1. The title id is tight to the database (I mean the vsh database stored on the hdd and modified upon package install)
2. Since 2.80 there is a nice new protection added called DRMDIR, basically they add a directory under the titleid folder (on the hdd) called DRMDIR which contains hashes of the PARAM.SFO and EBOOT.BIN files) This folder is created upon package install and will of course prevent you from replacing the PARAM.SFO (which is too bad since the database issue could have been bypassed after rebuilding it)
I still advice people to BUY their games rather than trying to run pirated versions of those every minutes. I mean, developers also do have to eat you know ?
Anyway this idea is stupid and wont work. (not to mention you would need to go through the hassle of decrypting, encrypting your hdd (which would take hours for each step) etc etc each time you want to change your game. Not worth the trouble, you are better off purchasing your games than doing this.
UPDATE: For those who wonder why not just replace the DRMDIR folder, its content is not viewable under user/game priviledges, also the hashes stored there are not the standard md5 or sha1 you are used to see but based on a hmac algorithm.