TPM can be used for DRM. If you roll all the hierarchy seeds though then the TPM can't be used for DRM and you can just be denied access to media. In order to use a TPM for DRM you need a fairly dystopian secure boot of a consumer OS that enforces all DRM -- this is very much a possibility, naturally, and TPM enables it but does not guarantee it (otherwise we'd already be there today, though we're heading in that direction now).