honestly, i'm not used to buying games via digital distribution thingy...

i recently bought SINS:entrenchment but i'm wondering about the repercussion of buying a digital copy compared to waiting for trinity then buy the game in-stores... i mean are there any amount of activation allowed per account? can i install it again and what are the process i need to do for me to reinstall it again in the future? can i install it in my laptop and desktop both at the same time or one rig at a time?

any FAQ or any info around here that i should read about? any link would be highly appreciated... thanks.