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What is: Digital Restrictions Management (DRM)
technology that proponents "claim" protects copyright related rights.
everyone must ask how this is accomplished, and what the costs are!
Technological Protection Measures (TPM) limit access to authorized persons, and encode identity information (digital signatures, watermarks)
Access Controls often compared to digital locks which keep people without keys out, denying access to unauthorized persons
copyright holders want to give access to authorized persons
copyright is a set of legal tools which limit what people who already have access can do with content
Access Controls and copyright seek to accomplish different goals. One can't be used to protect the other