“Contracting Parties shall provide adequate legal protection and effective legal remedies against the circumvention of effective technological measures that are used by authors in connection with the exercise of their rights under this Treaty or the Berne Convention and that restrict acts, in respect of their works, which are not authorized by the authors concerned or permitted by law, **provided that the technological measures preserve access to and do not interfers with activities permitted by the law.**

My reasoning is that TPM measures must maintain fair use as mandated by the law, and when the the copyrights etc expires, the same DRM measure must ensure unflattered access to the material as permitted by law.

i agree