EAC, CAP, CCD-Lock etc. currupts the TOC changing the bit from Audio to Data (DVD players won't play these). It also fucks up the Lead-In and other tracks (some players like many used in cars will read them wrong).
The reason Alcohol doesn't work because it sees the TOC says the control bit has been changed to data, it it "fixes" it, Alcohol knows it has been changed because the sub channel says it is Audio and not Data. This was made in case your reader was fooled by CDS200.
These freeware CDDA protectors will cause you (and your poor clients or your so-called friends you're giving them to) more problems.
CDDA cannot be protected it can only be currupted.