{"id":11442,"date":"2026-01-10T14:20:39","date_gmt":"2026-01-10T06:20:39","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/vn\/how-to-protect-a-pdf-with-a-password\/"},"modified":"2026-01-10T14:20:39","modified_gmt":"2026-01-10T06:20:39","slug":"how-to-protect-a-pdf-with-a-password","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/vn\/how-to-add-a-password-to-pdf-online","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 th\u00eam m\u1eadt kh\u1ea9u v\u00e0o PDF tr\u1ef1c tuy\u1ebfn"},"content":{"rendered":"<p><img alt=\"\" class=\"alignnone wp-image-13227\" decoding=\"async\" height=\"240\" loading=\"lazy\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-password-1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-password-1.png 480w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-password-1-300x201.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-password-1-150x101.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-password-1-400x268.png 400w\" width=\"358\"\/><\/p>\n<p>C\u00e1c t\u00e0i li\u1ec7u PDF c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ch\u1ee9a th\u00f4ng tin quan tr\u1ecdng ho\u1eb7c n\u1ed9i dung nh\u1ea1y c\u1ea3m. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0y, b\u1ea1n mu\u1ed1n b\u1ea3o v\u1ec7 ch\u00fang b\u1eb1ng m\u1eadt kh\u1ea9u v\u00e0 h\u1ea1n ch\u1ebf quy\u1ec1n ch\u1ec9nh s\u1eeda ho\u1eb7c vi\u1ebft th\u00eam. Tuy nhi\u00ean, tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh \u00e1p d\u1ee5ng m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF, b\u1ea1n n\u00ean bi\u1ebft r\u1eb1ng c\u00f3 hai lo\u1ea1i m\u1eadt kh\u1ea9u PDF.<\/p>\n<h2>Hai lo\u1ea1i m\u1eadt kh\u1ea9u PDF<\/h2>\n<h3>M\u1eadt kh\u1ea9u quy\u1ec1n h\u1ea1n<\/h3>\n<p>M\u1eadt kh\u1ea9u quy\u1ec1n h\u1ea1n h\u1ea1n ch\u1ebf vi\u1ec7c ch\u1ec9nh s\u1eeda, in \u1ea5n v\u00e0 sao ch\u00e9p b\u1ea5t k\u1ef3 n\u1ed9i dung n\u00e0o trong t\u1ec7p PDF. Ng\u01b0\u1eddi nh\u1eadn v\u1eabn c\u00f3 th\u1ec3 m\u1edf t\u1ec7p, nh\u01b0ng s\u1ebd kh\u00f4ng c\u00f3 quy\u1ec1n th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 thao t\u00e1c ch\u1ec9nh s\u1eeda, in \u1ea5n, sao ch\u00e9p hay c\u00e1c h\u1ea1n ch\u1ebf kh\u00e1c do ch\u1ee7 s\u1edf h\u1eefu \u0111\u1eb7t ra n\u1ebfu kh\u00f4ng c\u00f3 m\u1eadt kh\u1ea9u ch\u00ednh x\u00e1c.<\/p>\n<h3>M\u1eadt kh\u1ea9u truy c\u1eadp t\u00e0i li\u1ec7u<\/h3>\n<p>Tr\u01b0\u1edbc khi b\u1ea1n c\u00f3 th\u1ec3 m\u1edf t\u00e0i li\u1ec7u PDF, b\u1ea1n s\u1ebd c\u1ea7n nh\u1eadp m\u1eadt kh\u1ea9u ch\u00ednh x\u00e1c \u0111\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp v\u00e0 xem n\u1ed9i dung PDF.<\/p>\n<p><img alt=\"\" class=\"alignnone size-full wp-image-19325\" decoding=\"async\" height=\"321\" loading=\"lazy\" sizes=\"auto, (max-width: 561px) 100vw, 561px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/set-password-for-pdf.jpg\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/set-password-for-pdf.jpg 561w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/set-password-for-pdf-300x172.jpg 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/set-password-for-pdf-150x86.jpg 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/08\/set-password-for-pdf-400x229.jpg 400w\" width=\"561\"\/><\/p>\n<h2>T\u1ea1i sao b\u1ea1n c\u1ea7n \u0111\u1eb7t m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF c\u1ee7a m\u00ecnh<\/h2>\n<p>B\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m v\u00e0 \u0111\u1ea3m b\u1ea3o truy c\u1eadp h\u1ee3p ph\u00e1p v\u00e0o c\u00e1c t\u1ec7p s\u1ed1 l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng trong th\u1ebf gi\u1edbi s\u1ed1 hi\u1ec7n nay. M\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt l\u00e0 th\u00eam m\u1eadt kh\u1ea9u v\u00e0o c\u00e1c t\u1ec7p PDF. B\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt, ri\u00eang t\u01b0 v\u00e0 ki\u1ec3m so\u00e1t, \u0111\u1ea3m b\u1ea3o ch\u1ec9 nh\u1eefng c\u00e1 nh\u00e2n \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0 xem n\u1ed9i dung. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u00fd do t\u1ea1i sao vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u v\u00e0o t\u1ec7p PDF c\u00f3 th\u1ec3 mang l\u1ea1i l\u1ee3i \u00edch:<\/p>\n<ul>\n<li><strong>B\u1ea3o m\u1eadt v\u00e0 ri\u00eang t\u01b0:<\/strong>Vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u v\u00e0o c\u00e1c t\u1ec7p PDF c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt. N\u1ebfu b\u1ea1n \u0111ang chia s\u1ebb c\u00e1c t\u1ec7p PDF ch\u1ee9a th\u00f4ng tin c\u00e1 nh\u00e2n ho\u1eb7c b\u00ed m\u1eadt, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00e0i li\u1ec7u t\u00e0i ch\u00ednh ho\u1eb7c h\u1ee3p \u0111\u1ed3ng ph\u00e1p l\u00fd, vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 gi\u00fap b\u1ea3o v\u1ec7 t\u00ednh ri\u00eang t\u01b0 c\u1ee7a th\u00f4ng tin. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o ch\u1ec9 nh\u1eefng c\u00e1 nh\u00e2n \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n c\u00f3 m\u1eadt kh\u1ea9u m\u1edbi c\u00f3 th\u1ec3 xem n\u1ed9i dung t\u1ec7p PDF.<\/li>\n<li><strong>Tu\u00e2n th\u1ee7:<\/strong>Vi\u1ec7c b\u1ea3o v\u1ec7 t\u1ec7p PDF b\u1eb1ng m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n tu\u00e2n th\u1ee7 c\u00e1c y\u00eau c\u1ea7u ng\u00e0nh ho\u1eb7c quy \u0111\u1ecbnh v\u1ec1 b\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n x\u1eed l\u00fd d\u1eef li\u1ec7u c\u00e1 nh\u00e2n d\u01b0\u1edbi s\u1ef1 gi\u00e1m s\u00e1t c\u1ee7a c\u00e1c lu\u1eadt b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u nh\u01b0 GDPR ho\u1eb7c HIPAA, vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t ph\u1ea7n trong c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt \u0111\u1ec3 \u0111\u00e1p \u1ee9ng ngh\u0129a v\u1ee5 tu\u00e2n th\u1ee7.<\/li>\n<li><strong>B\u1ea3o v\u1ec7 t\u00e0i s\u1ea3n tr\u00ed tu\u1ec7:<\/strong>N\u1ebfu b\u1ea1n c\u00f3 t\u00e0i s\u1ea3n tr\u00ed tu\u1ec7 qu\u00fd gi\u00e1 trong c\u00e1c t\u1ec7p PDF c\u1ee7a m\u00ecnh, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00f4ng tin \u0111\u1ed9c quy\u1ec1n, b\u00ed m\u1eadt kinh doanh ho\u1eb7c n\u1ed9i dung c\u00f3 b\u1ea3n quy\u1ec1n, vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u c\u00f3 th\u1ec3 gi\u00fap b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i vi\u1ec7c sao ch\u00e9p, in \u1ea5n ho\u1eb7c chia s\u1ebb n\u1ed9i dung m\u1ed9t c\u00e1ch kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p.<\/li>\n<\/ul>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u00e1p d\u1ee5ng b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u tr\u1ef1c tuy\u1ebfn?<\/h2>\n<p>D\u1ec5 d\u00e0ng th\u00eam b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u tr\u1ef1c tuy\u1ebfn b\u1eb1ng Tr\u00ecnh ch\u1ec9nh s\u1eeda PDF mi\u1ec5n ph\u00ed VP Online<\/p>\n<p><strong>B\u01b0\u1edbc 1: T\u1ea3i l\u00ean t\u1ec7p PDF c\u1ee7a b\u1ea1n<\/strong><\/p>\n<p id=\"CevelJx\"><img alt=\"\" class=\"alignnone size-full wp-image-19328\" decoding=\"async\" height=\"355\" loading=\"lazy\" sizes=\"auto, (max-width: 713px) 100vw, 713px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/04\/img_64425baf760d1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/04\/img_64425baf760d1.png 713w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/04\/img_64425baf760d1-300x149.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/04\/img_64425baf760d1-150x75.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2023\/04\/img_64425baf760d1-400x199.png 400w\" width=\"713\"\/><\/p>\n<p><strong>B\u01b0\u1edbc 2: Ch\u1ec9nh s\u1eeda ho\u1eb7c nh\u1eadp n\u1ed9i dung ph\u00f9 h\u1ee3p, sau \u0111\u00f3<\/strong><\/p>\n<ul>\n<li>Nh\u1ea5n v\u00e0o \u201cXu\u1ea5t\u201d<\/li>\n<li>\u201cL\u01b0u d\u01b0\u1edbi d\u1ea1ng PDF\u201d<\/li>\n<\/ul>\n<p><img alt=\"\" class=\"alignnone wp-image-13247 size-full\" decoding=\"async\" height=\"241\" loading=\"lazy\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM.png 350w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM-300x207.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM-150x103.png 150w\" width=\"350\"\/><\/p>\n<p>\u00a0<\/p>\n<p><strong>B\u01b0\u1edbc 3<\/strong>: \u0110i t\u1edbi<strong>Thu\u1ed9c t\u00ednh t\u00e0i li\u1ec7u<\/strong>\u00a0-&gt;\u00a0<strong>B\u1ea3o m\u1eadt<\/strong>\u00a0-&gt;\u00a0<strong>B\u1ea3o m\u1eadt t\u00e0i li\u1ec7u<\/strong><\/p>\n<p>Ki\u1ec3m tra v\u00e0 ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c c\u00e0i \u0111\u1eb7t quy\u1ec1n h\u1ea1n ph\u00f9 h\u1ee3p. Sau \u0111\u00f3 nh\u1ea5n<strong>\u0110\u1ed3ng \u00fd<\/strong>\u00a0v\u00e0\u00a0<strong>Xu\u1ea5t<\/strong>.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-13288 size-full\" decoding=\"async\" height=\"625\" loading=\"lazy\" sizes=\"auto, (max-width: 862px) 100vw, 862px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM.png 862w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-300x218.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-768x557.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-150x109.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-400x290.png 400w\" width=\"862\"\/><\/p>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">Tr\u00ecnh ch\u1ec9nh s\u1eeda PDF mi\u1ec5n ph\u00ed tr\u1ef1c tuy\u1ebfn Visual Paradigm<\/a> r\u1ea5t d\u1ec5 s\u1eed d\u1ee5ng v\u00e0 \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 qu\u1ea3n l\u00fd. H\u00e3y ch\u1eafc ch\u1eafn ki\u1ec3m tra tr\u00ecnh ch\u1ec9nh s\u1eeda tuy\u1ec7t v\u1eddi n\u00e0y \u0111\u1ec3 kh\u00e1m ph\u00e1 th\u00eam c\u00e1c t\u00ednh n\u0103ng ch\u1ec9nh s\u1eeda PDF tr\u1ef1c tuy\u1ebfn.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1c t\u00e0i li\u1ec7u PDF c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ch\u1ee9a th\u00f4ng tin quan tr\u1ecdng ho\u1eb7c n\u1ed9i dung nh\u1ea1y c\u1ea3m. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0y, b\u1ea1n mu\u1ed1n b\u1ea3o v\u1ec7 ch\u00fang b\u1eb1ng m\u1eadt kh\u1ea9u v\u00e0 h\u1ea1n ch\u1ebf quy\u1ec1n ch\u1ec9nh s\u1eeda ho\u1eb7c vi\u1ebft th\u00eam. Tuy nhi\u00ean, tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh \u00e1p d\u1ee5ng m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF, b\u1ea1n [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11443,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-11442","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","loop-entry","clr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 th\u00eam m\u1eadt kh\u1ea9u v\u00e0o PDF tr\u1ef1c tuy\u1ebfn - Visual Paradigm Blog<\/title>\n<meta name=\"description\" content=\"Your PDFs may contain important information or sensitive content.\u00a0 Protect it with a password and restrict permission from further editing or writing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.visual-paradigm.com\/vn\/how-to-add-a-password-to-pdf-online\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 th\u00eam m\u1eadt kh\u1ea9u v\u00e0o PDF tr\u1ef1c tuy\u1ebfn - 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