{"id":2391,"date":"2026-03-06T16:21:13","date_gmt":"2026-03-06T08:21:13","guid":{"rendered":"https:\/\/updates.visual-paradigm.com\/vn\/releases\/how-to-protect-a-pdf-with-password\/"},"modified":"2026-03-06T16:21:13","modified_gmt":"2026-03-06T08:21:13","slug":"how-to-protect-a-pdf-with-password","status":"publish","type":"releases","link":"https:\/\/updates.visual-paradigm.com\/vn\/releases\/how-to-protect-a-pdf-with-password\/","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u"},"content":{"rendered":"<p>M\u1eadt kh\u1ea9u l\u00e0 bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt ch\u00ednh \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0o t\u00e0i li\u1ec7u PDF. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t kh\u00f3a \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 th\u00f4ng tin. B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng<a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">C\u00f4ng c\u1ee5 ch\u1ec9nh s\u1eeda PDF tr\u1ef1c tuy\u1ebfn Visual Paradigm Online<\/a>\u0111\u1ec3 th\u00eam m\u1eadt kh\u1ea9u b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u1ea7n c\u00f3 m\u1eadt kh\u1ea9u \u0111\u1ec3 xem n\u1ed9i dung t\u1ec7p tin. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u tr\u00ean VP Online!<\/p>\n<p><!--more--><\/p>\n<p><iframe allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"\" frameborder=\"0\" height=\"281\" referrerpolicy=\"strict-origin-when-cross-origin\" src=\"https:\/\/www.youtube.com\/embed\/HFQyuF21Ec4?feature=oembed\" title=\"How to Protect a PDF with Password without using PDF Editor\" width=\"500\"><\/iframe><\/p>\n<h4>B\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u<\/h4>\n<p>B\u1ea1n c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 quy\u1ec1n truy c\u1eadp v\u00e0o t\u1ec7p tin PDF c\u1ee7a m\u00ecnh b\u1eb1ng m\u1eadt kh\u1ea9u, b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng<a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">Visual Paradigm Online<\/a>.<\/p>\n<ol>\n<li>Sau khi \u0111\u0103ng nh\u1eadp v\u00e0o kh\u00f4ng gian l\u00e0m vi\u1ec7c Visual Paradigm Online c\u1ee7a b\u1ea1n, h\u00e3y truy c\u1eadp b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 ch\u1ecdn \u1ee8ng d\u1ee5ng, PDF, \u0111\u1ec3 \u0111\u1ebfn kh\u00f4ng gian l\u00e0m vi\u1ec7c PDF c\u1ee7a b\u1ea1n\n<p id=\"mLZHmWz\"><img fetchpriority=\"high\" alt=\"\" class=\"alignnone size-full wp-image-2100\" decoding=\"async\" fetchpriority=\"high\" height=\"275\" src=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efe867542.png\" width=\"218\"\/><\/p>\n<\/li>\n<li>Nh\u1ea5n n\u00fat \u201cC\u00d4NG C\u1ee4\u201d v\u00e0 ch\u1ecdn \u201cB\u1ea3o v\u1ec7 PDF\u201d.\n<p id=\"SDgtaqj\"><img alt=\"\" class=\"alignnone size-full wp-image-2101\" decoding=\"async\" height=\"542\" sizes=\"(max-width: 399px) 100vw, 399px\" src=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efeb51413.png\" srcset=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efeb51413.png 399w, https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efeb51413-221x300.png 221w\" width=\"399\"\/><\/p>\n<\/li>\n<li>T\u1ea3i l\u00ean c\u00e1c t\u1ec7p tin PDF c\u1ee7a b\u1ea1n. Sau khi t\u1ea3i l\u00ean t\u1ec7p tin PDF, b\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1eadt kh\u1ea9u PDF c\u1ee7a m\u00ecnh \u1edf ph\u00eda d\u01b0\u1edbi, v\u00e0 nh\u1ea5n n\u00fat b\u1ea3o v\u1ec7 \u0111\u1ec3 ti\u1ebfp t\u1ee5c<img alt=\"\" class=\"alignnone size-full wp-image-2102\" decoding=\"async\" height=\"574\" sizes=\"(max-width: 971px) 100vw, 971px\" src=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efee28c4a.png\" srcset=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efee28c4a.png 971w, https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efee28c4a-300x177.png 300w, https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8efee28c4a-768x454.png 768w\" style=\"font-style: inherit; font-weight: inherit;\" width=\"971\"\/><\/li>\n<li>B\u00e2y gi\u1edd m\u1eadt kh\u1ea9u l\u00e0 b\u1eaft bu\u1ed9c \u0111\u1ec3 m\u1edf t\u1ec7p tin PDF. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ed5i t\u00ean t\u1ec7p tin PDF n\u1ebfu c\u1ea7n v\u00e0 nh\u1ea5n n\u00fat T\u1ea3i xu\u1ed1ng \u0111\u1ec3 t\u1ea3i v\u1ec1.\n<p id=\"tLHkbQW\"><img loading=\"lazy\" alt=\"\" class=\"alignnone size-full wp-image-2103\" decoding=\"async\" height=\"408\" loading=\"lazy\" sizes=\"auto, (max-width: 1002px) 100vw, 1002px\" src=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8eff12e037.png\" srcset=\"https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8eff12e037.png 1002w, https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8eff12e037-300x122.png 300w, https:\/\/updates.visual-paradigm.com\/wp-content\/uploads\/2026\/03\/img_69a8eff12e037-768x313.png 768w\" width=\"1002\"\/><\/p>\n<\/li>\n<\/ol>\n<h5><strong>B\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u tr\u1ef1c tuy\u1ebfn, d\u1ec5 d\u00e0ng v\u00e0 mi\u1ec5n ph\u00ed tr\u00ean<a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">Tr\u00ecnh ch\u1ec9nh s\u1eeda VP Online<\/a>.<\/strong><\/h5>\n<p>\u00a0<\/p>\n","protected":false},"featured_media":2392,"template":"","meta":{"_acf_changed":false,"_yoast_wpseo_title":"M\u1eadt kh\u1ea9u l\u00e0 bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt ch\u00ednh \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0o t\u00e0i li\u1ec7u PDF. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t kh\u00f3a \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 th\u00f4ng tin.","_yoast_wpseo_metadesc":"Passwords are the primary security measure to prevent unauthorized access to PDF documents. 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