libdvdcss är lagligt...

libdvdcss has never been fought over in a courtroom, in part because Section 1201(f) of the Digital Millennium Copyright Act authorizes such circumvention for purposes of software interoperability.

* (f) Reverse Engineering. -
o (1) Notwithstanding the provisions of subsection (a)(1)(A), a person who has lawfully obtained the right to use a copy of a computer program may circumvent a technological measure that effectively controls access to a particular portion of that program for the sole purpose of identifying and analyzing those elements of the program that are necessary to achieve interoperability of an independently created computer program with other programs, and that have not previously been readily available to the person engaging in the circumvention, to the extent any such acts of identification and analysis do not constitute infringement under this title.
o (2) Notwithstanding the provisions of subsections (a)(2) and (b), a person may develop and employ technological means to circumvent a technological measure, or to circumvent protection afforded by a technological measure, in order to enable the identification and analysis under paragraph (1), or for the purpose of enabling interoperability of an independently created computer program with other programs, if such means are necessary to achieve such interoperability, to the extent that doing so does not constitute infringement under this title.
o (3) The information acquired through the acts permitted under paragraph (1), and the means permitted under paragraph (2), may be made available to others if the person referred to in paragraph (1) or (2), as the case may be, provides such information or means solely for the purpose of enabling interoperability of an independently created computer program with other programs, and to the extent that doing so does not constitute infringement under this title or violate applicable law other than this section.
o (4) For purposes of this subsection, the term ''interoperability'' means the ability of computer programs to exchange information, and of such programs mutually to use the information which has been exchanged.

Ibland kan kopieringsspärrar hindra att man tittar eller lyssnar på en cd- eller dvd-skiva, t.ex. i sin dator. I sådana fall får man bryta spärren för att kunna lyssna eller titta på det som finns på skivan.

Det är förbjudet att tillverka, sälja och hyra ut produkter för kringgående av tekniska åtgärder m.m. Det är också förbjudet att i förvärvssyfte inneha sådana produkter.

[Q & A]
Hur blir det om ett kopieringsskydd t.ex. hindrar personer med funktionshinder att göra de kopior de behöver för att kunna ta del av upphovsrättsligt skyddat material, t.ex. genom ett hjälpmedel som en talsyntes?

Då finns en möjlighet att gå till domstol och begära ett föreläggande mot rättighetshavarna. Rättighetshavaren är alltså skyldig att se till att det går att göra t.ex. de kopior som personer med funktionshinder har rätt att göra enligt lagen.