_Auster_: My physical copy of Outlive thinks differently.
First, I need to type a CD key so it can even install the game.
Then, once installed, whenever I want to play the game, I need to have the disc or ISO mounted for it to get past the starting screen, even though the game is already installed.
And the disc or ISO must be mounted in the same partition as the one where it was during installation.
At least there's a silver lining: no Securom, StarForce, or any of those potentially system-bricking DRMs.
Until the early to mid 2000's, it was actually common practice to only copy some of the program files onto the hard drive and leave most of the game data files on the CDs.
This was not considered copy protection at all. You need to remember that hard drives were a lot smaller 20 years ago. In 2000 you were lucky to get a new stock computer with a 20gb drive even if 100gb drives were available in 2001. In 1997 4gb was considered standard for stock computers.
So as a space-saving measure the games tried to copy the minimum amount onto the hard drive as a CD-ROM held 650 or 700mb of data. Some games even used disc swapping with CDs. Off the top of my head Final Fantasy VII &VIII, Baldur's Gate I and II, Planescape Torment, and many others.
Also a lot of older games from the '90s and early 2000's had options to install "minimum" "normal" and "full" installs. Generally a "full" install meant you didn't have to have the CD in the drive or only have one CD in the drive, while "minimum" meant most of the content was on the CD. ,
That did not mean the games were copy protected, and nobody considered needing the CD in the drive to be copy protection after 1997 when burners became common. They used other methods.
Yes, I'll grant that some companies considered needing the CD to be in the drive to be an effective form of copy protection in the
early 1990's before home CD burners were available. However it was generally more about saving hard drive space and taking advantage of the fact that the average hard drive in the 1990's was measured in megabytes instead of gigabytes while CDs had a whopping 650mb.
As late as 1995 computers were coming with hard drives with as little as 80mb hard drives. Then there was an advancement in storage to make larger drives cheaper and drives up to 1gb started appearing in stock computers.
Tl;DR? Requiring the disk in the drive with no protections against copying the disk was about saving hard drive space, not copy protection. It made sense 20 years ago and made a lot of sense 25 years ago when backing up your hard drive onto a couple CD-Rs was a cheap and easy backup plan. The computer I got in 1997 could do that with 4 700mb CD-ROM (at least until I replaced its 4gb drive with a 100gb drive around 2001).