Posted July 16, 2014
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CDs - at least properly pressed and properly cared-for ones - are expected to last between 30 and 100 years. Obviously, nobody can tell if they'll actually last 100 years, but there are music CDs from the mid-1980s still in circulation that still play perfectly.
The only people I ever see claiming that their CDs and DVDs have somehow rotted through no fault of their own are the people trying to drive home some ideological point about physical media being dead. And when I've seen such degradation, there has always been some underlying cause - games left out of their boxes in the sun, kids handling the games unchecked, a complete lack of discipline when handling the games with discs lying about on carpets, rugs, dirty tables and so on.
In fact, I actually used to think that magnetic media were the exception when it came to game media preservation, and that they degraded somewhat more quickly. Even there I've been proven wrong - I've just received a whole bunch of 1980s C64 games on 5.25" disc, and all of them bar one work perfectly.
All I said is that these types of copy-protection can be seen as DRM because of:
1) the lifetime of the game is linked to the lifetime of the disk (your game can be 'revoked', be it in 1 year or in 100 years)
2) the access of the game is linked to access of the disk (you can not play as many copies as you want when you want)
and that was all it was... I see from your post that you do not disagree with either. the rest then is just a matter of which type of DRM you prefer or not.
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Also considering the rather long lifespan of CD-ROMs and DVD-ROMs, I don't consider it plausible that the game publishers see that as the point to use copy protection (ie. that you can play the game only for a limited time). But in a broader sense, copy protection has same purpose as (online) DRM, ie. some level of control to the publisher over how people use their license. But with online DRM, the publisher can also change the restrictions afterwards.
Post edited July 16, 2014 by amok