Yes that's right, it violates section 1201(a)(2) of the Digital Millenium Copyright Act.
https://www.cs.cmu.edu/~dst/DeCSS/dmca-1200.txt
Let me share a bit of code with you:
/* efdtt.c Author: Charles M. Hannum <root@ihack.net> */
/* */
/* Thanks to Phil Carmody <fatphil@asdf.org> for additional tweaks. */
/* */
/* Length: 434 bytes (excluding unnecessary newlines) */
/* */
/* Usage is: cat title-key scrambled.vob | efdtt >clear.vob */
#define m(i)(x[i]^s[i+84])<<
unsigned char x[5],y,s[2048];main(n){for(read(0,x,5);read(0,s,n=2048);write(1,s
,n))if(s[y=s[13]%8+20]/16%4==1){int i=m(1)17^256+m(0)8,k=m(2)0,j=m(4)17^m(3)9^k
*2-k%8^8,a=0,c=26;for(s[y]-=16;--c;j*=2)a=a*2^i&1,i=i/2^j&1<<24;for(j=127;++j<n
;c=c>y)c+=y=i^i/8^i>>4^i>>12,i=i>>8^y<<17,a^=a>>14,y=a^a*8^a<<6,a=a>>8^y<<9,k=s
[j],k="7Wo~'G_\216"[k&7]+2^"cr3sfw6v;*k+>/n."[k>>4]*2^k*257/8,s[j]=k^(k&k*2&34)
*6^c+~y;}}
As you can see, it's a small bit of C code written by Charles Hannum and Phil Carmody that can decrypt DVDs.
This is old news I know, but it was a big deal back in the day. This is a variation of the infamous DeCSS code that the MPAA tried to suppress.
Even if this post gets flagged a hundred times, this code will now be a (permanent?) part of the Steemit blockchain.
For more information, Dr. David S. Touretzky has a great web page showing DeCSS in all it's forms:
https://www.cs.cmu.edu/~dst/DeCSS/Gallery/