If you want to study the topics planned for Volume 6 (parsing, language theory, compilers), I suggest:
Would you like legitimate resources for the existing volumes or Knuth’s draft materials instead? the art of computer programming volume 6 pdf
Note on Availability: While The Art of Computer Programming is a legendary series, it is important to note that Volume 6 has not yet been officially published in a completed, physical form. If you want to study the topics planned
Donald Knuth has spent decades refining the earlier volumes (Volumes 1, 2, 3, and 4A/4B). He is currently actively working on the fascicles (pre-publication drafts) for Volume 4. The content intended for Volume 6—focusing on the Theory of Context-Free Languages—is in the drafting stages. While snippets and fascicles may circulate online in PDF format, a definitive, polished "Volume 6 PDF" does not exist in the same capacity as the earlier, finalized volumes. Readers are encouraged to check the Stanford University website for the latest official fascicles and updates on the series' progress. Would you like legitimate resources for the existing
Knuth releases fascicles on his Stanford website (free, officially). Search for fasc6a.pdf or fasc7.pdf from cs.stanford.edu/~knuth. These are real, legal, and free.
Many academic libraries have purchased digital licenses for TAOCP via Safari Books Online or O’Reilly Learning. You can legally read high-quality PDFs of published volumes for free with a student login.