using alcohol 120 and daemon tools is 100% legal and i doubt is against bnet rules because it isnt really third party software that changes the way you play the game. the legality of it is that you must own the disk and your using it has to be for cd protection or backup purposes only. i've never used daemon tools but have used alcohol 120% many times. you put in the cd you want and use the "image making wizard" or something like that. when you can select what type of image you want select mdf/mds (iso never worked /w me for d2, even tho its a more popular format) basicly this will save the contents of your cd to your comptuter to where you tell it to into 2 filesUsing either of those two tools will most likely result in a CD-key ban. So if you value your key's worth, just use the original playdisc CD in your drive and simply copy the d2music.mpq file from the play disc into your Diablo 2 dir. This will in effect allow you to play Diablo solely from your HD, so no more slowdowns when entering new areas. The original playdisc CD will have to remain in your CDrom, but will spin down.