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Ethically, fixing a corrupt copy you already own (e.g., a legally scanned interlibrary loan) is defensible. Distributing the fixed PDF widely is not.
Unlike modern software patches, there is no official errata or PDF update from the publishers (CRC Press, now defunct for this title). The "art of the fix" has become a grassroots compiler engineering challenge in its own right. the art of compiler design theory and practice pdf fix