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For traditional students, a PDF is a study aid, not a replacement for ijazah (license). The Jawahirul Lama’ah is often taught with a chain (sanad) going back to al-Malibari. Therefore, while a high-quality PDF helps memorization, seek a live teacher for disputed rulings.
Scholars of Islamic law often upload high-quality PDFs of classical commentaries to share with students. Create a free account and search for the exact Arabic title. Many academic uploads include marginal notes (hashiyah), which greatly enhance the "high quality" aspect.
In Indonesia, the Pondok Pesantren Digital Library (e.g., Lajnah Talifiyah or PonPes Al-Bidayah) has digitized thousands of manuscripts. Search for: