Not so.
Some of the systems used at the time such as
Cactus Data Shield and MacroVision SafeAudio deliberately introduced errors into the data on the disc (either/and/or the music data itself, error correction data, or the Table of Contents, depending on the copy protection system).
Regular audio CD players will usually apply simple linear interpolation of the missing data and continue to play the music.
Data devices, such as CD-ROMs, don't use linear interpolation for errors in data reads, and are usually rather more fussy about their checksums adding up properly; they reject the data and refuse to play, or play with significant audio errors (pops, dropouts, etc.). It does rather depend on the particular firmware of each drive, though, so they may work in some computers and not others. Equally, they would sometimes not play on ostensible audio players such as car CD players, which used mechanisms designed for [laptop] computer use.
Effectively (especially with SafeAudio since that was the start and the finish of how it worked) they were pre-scratching the discs, knowing that computer CD drives have a harder time dealing with errors than audio drives. One other upshot of this was that if/when these discs did suffer normal minor scratches, etc., they were much more likely to fail on any player, since the available error correction mechanisms were subverted in the factory.
When the labels were messing with the discs they were selling in this way, Phillips eventually refused to license them use of the Compact Disc logo, because they did not adhere to the Red Book standard. Even if it's not mentioned, you can sometimes tell whether a disk is copy protected because the CD logo is missing on the packaging. I successfully returned some of these discs back to shops at the time on the basis that they had not actually sold me a Compact Disc when it was not apparent from the outside packaging, though they were in the racks with Compact Discs.