Conference Report (H. Rep. No. 105-796):
In general (pages 64-65):
Section 1201(a) and 1202--technological measures. It is the understanding of the conferees that technological measures will most often be developed through consultative, private sector efforts by content owners, and makers of computers, consumer electronics and telecommunications devices. The conferees expect this consultative approach to continue as a constructive and positive method. One of the benefits of such consultation is to allow testing of proposed technologies to determine whether there are adverse effects on the ordinary performance of playback and display equipment in the marketplace, and to take steps to eliminate or substantially mitigate those effects before technologies are introduced. The public interest is well-served by such activities.
Persons may also choose to implement a technological measure without vetting it through an inter-industry consultative process, or without regard to the input of affected parties. Under such circumstances, such a technological measure may materially degrade or otherwise cause recurring appreciable adverse effects on the authorized performance or display of works. Steps taken by the makers or servicers of consumer electronics, telecommunications or computing products used for such authorized performances or displays solely to mitigate these adverse effects on product performance (whether or not taken in combination with other lawful product modifications) shall not be deemed a violation of sections 1201(a) or (b).
However, this construction is not meant to afford manufacturers or servicers an opportunity to give persons unauthorized access to protected content, or to exercise the rights under the Copyright Act of copyright owners in such works, under the guise of "correcting’" a performance problem that results from the implementation of a particular technological measure. Thus, it would violate sections 1201(a) or (b) for a manufacturer or servicer to take remedial measures if they are held out for or undertaken with, or result in equipment with only limited commercially significant use other than, the prohibited purpose of allowing users to gain unauthorized access to protected content or to exercise the rights under the Copyright Act of copyright owners in such works.
With regard to section 1202, product adjustments made to eliminate recurring appreciable adverse effects on the authorized performance or display of works caused by copyright management information will not be deemed a violation of section 1202 unless such steps are held out for or undertaken with a prohibited purpose, or the requisite knowledge, of inducing, enabling, facilitating or concealing infringement of rights of copyright owners under the Copyright Act.