DRM only makes media useless if it cannot be decrypted. What makes it legal for my commercially made DVD player to decrypt a disc, but not for libdvdcss to do it? DVDs don't have labels saying that use of libdvdcss is not allowed. If both are being used only to watch the video in the appropriate region, is there any meaningful legal difference between the two CSS decryptors? Can a copyright holder say "this disc may only be decrypted with libdvdcss; use of any other software is unlawful circumvention"?
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