DVD Reader Vs Ripper Softwares

Hi all,

I have two general questions:

1) Does using Windows DVD ripper application softwares (like DVD Shrink or DVD Decrypter etc.,) damages/corrupts your DVD reader?

2) What is the legal status upon using such softwares? (Most of these softwares are either freewares or sharewares)

Share your opinions,
Thanks for your replies,

Have a nice day,
Regards
Vijay