JT Harkey’s list seems slightly incorrect to me, so here’s a brief one:
King’s Quest 6 (kept the disk version protection)
Quest for Glory 4 (kept the disk version protection)
Space Quest 6 (contentious ‘copy protection’)
Freddy Pharkas (kept disk version protection)
SQ4CD has NO copy protection, neither does KQ5CD. Both disk versions’ protection were removed with the CD rerelease.
Larry 5 was not a ‘LSL5CD release’, but just a SierraOriginals version, so it doesn’t count.
I think those 4 are all.