This is different. You can always turn off the plugin or disable it you
really want to.
From Defective by design:
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"Big Media describe DRM as Digital Rights Management. However, since its
purpose is to restrict you the user, it is more accurate to describe DRM as
Digital Restrictions Management. DRM Technology can restricts users’ access
to movies, music, literature and software, indeed all forms of digital data.
Unfree software implementing DRM technology is simply a prison in which users
can be put to deprive them of the rights that the law would otherwise allow
them."
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The key word I see being prison. A plugin like that isn't like being in
prison because you are still in control. The plugin is easily disabled. I
guess the analogy would be like locking yourself in a room with no TV so you
can study but you still have the keys on you so you can easily get out. True
DRM would be the same except someone locks you in and you can't get out.