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Yes — this can violate the right to privacy protected by Article 26 of the Civil Code. In Spouses Hing v. Choachuy (G.R. No. 179736), the Supreme Court held that installing CCTV cameras aimed at a neighbor's property, capturing activities in an area where the neighbor has a reasonable expectation of privacy, is an actionable intrusion into privacy for which damages and injunctive relief may be sought.
The right is not absolute — it protects against unreasonable intrusion into an area where a person has a reasonable expectation of privacy. Ordinary security cameras that cover one's own premises are generally permissible; the wrong lies in aiming them to pry into a neighbor's private space.
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Research aid — not legal advice. Verify the current text against the Official Gazette. Provisions may have been amended or repealed. Using this page creates no attorney-client relationship. For legal advice, consult a Philippine lawyer.