Since the mid 90’s the browser war has raged. Netscape, Microgarbage, advent of webkit, etc. Well now the war is in the courts using CDM, and DRM to control copyright.
Apparently now the Licensing of this content protection is going to allow for the restriction of the client software you can use to access this protected data.
Samuel brings up many good points about how this will be abused and ultimately restrict the end user. So much for the utopia of the internet
Make sure to contact Widevine to make your opinion heard on why the delays in allowing other browsers in the fold.