@foone drm specifically? or hdcp, the copy protection/encryption method used with hdmi?
if the latter, there are hdcp transmitters. there are several models listed on kramerav[dot]com that have hdmi in and twister pair, such as "HDBaseT" out. these pair with a receiver to convert the twisted pair signal to hdmi.
there reasonably be inline hdcp injector/convertors for hdmi but have not found any so far.