{"id":11426,"date":"2026-01-10T14:08:39","date_gmt":"2026-01-10T06:08:39","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/vn\/password-protect-a-a-pdf\/"},"modified":"2026-01-10T14:08:39","modified_gmt":"2026-01-10T06:08:39","slug":"password-protect-a-a-pdf","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/vn\/password-protect-a-pdf\/","title":{"rendered":"B\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u"},"content":{"rendered":"<p>B\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c t\u00e0i li\u1ec7u PDF b\u1eb1ng c\u00e1ch \u0111\u1eb7t m\u1eadt kh\u1ea9u v\u00e0 gi\u1edbi h\u1ea1n m\u1ed9t s\u1ed1 ch\u1ee9c n\u0103ng, ch\u1eb3ng h\u1ea1n nh\u01b0 in \u1ea5n v\u00e0 ch\u1ec9nh s\u1eeda. Trong video n\u00e0y, b\u1ea1n s\u1ebd th\u1ea5y c\u00e1ch s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 c\u1ee7a ch\u00fang t\u00f4i <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<\/a> \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF c\u1ee7a b\u1ea1n.<\/p>\n<div class=\"epyt-video-wrapper\"><iframe allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" class=\"__youtube_prefs__ epyt-is-override no-lazyload\" data-no-lazy=\"1\" data-origheight=\"480\" data-origwidth=\"854\" data-skipgform_ajax_framebjll=\"\" height=\"480\" id=\"_ytid_18768\" loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/n5CVCthBvn8?enablejsapi=1&amp;autoplay=0&amp;cc_load_policy=0&amp;cc_lang_pref=&amp;iv_load_policy=1&amp;loop=0&amp;modestbranding=0&amp;rel=1&amp;fs=1&amp;playsinline=0&amp;autohide=2&amp;theme=dark&amp;color=red&amp;controls=1&amp;\" title=\"YouTube player\" width=\"854\"><\/iframe><\/div>\n<p>B\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c t\u00e0i li\u1ec7u PDF b\u1eb1ng c\u00e1ch \u0111\u1eb7t m\u1eadt kh\u1ea9u v\u00e0 gi\u1edbi h\u1ea1n m\u1ed9t s\u1ed1 ch\u1ee9c n\u0103ng, ch\u1eb3ng h\u1ea1n nh\u01b0 in \u1ea5n v\u00e0 ch\u1ec9nh s\u1eeda. Tuy nhi\u00ean, b\u1ea1n kh\u00f4ng th\u1ec3 ng\u0103n c\u1ea3n vi\u1ec7c l\u01b0u b\u1ea3n sao c\u1ee7a t\u00e0i li\u1ec7u PDF. B\u1ea3n sao s\u1ebd c\u00f3 c\u00f9ng c\u00e1c gi\u1edbi h\u1ea1n nh\u01b0 t\u00e0i li\u1ec7u g\u1ed1c. C\u00f3 hai lo\u1ea1i m\u1eadt m\u00e3 s\u1eb5n c\u00f3:<\/p>\n<ul>\n<li><strong>M\u1eadt kh\u1ea9u m\u1edf t\u1ec7p<\/strong><br \/>\nM\u1eadt kh\u1ea9u m\u1edf t\u00e0i li\u1ec7u y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng nh\u1eadp m\u1eadt kh\u1ea9u \u0111\u1ec3 m\u1edf t\u00e0i li\u1ec7u PDF.<\/li>\n<li><strong>M\u1eadt kh\u1ea9u quy\u1ec1n h\u1ea1n<\/strong><br \/>\nM\u1eadt kh\u1ea9u quy\u1ec1n h\u1ea1n: M\u1ed9t m\u1eadt kh\u1ea9u l\u00e0 b\u1eaft bu\u1ed9c \u0111\u1ec3 thay \u0111\u1ed5i c\u00e0i \u0111\u1eb7t quy\u1ec1n h\u1ea1n. V\u1edbi m\u1eadt kh\u1ea9u quy\u1ec1n h\u1ea1n, b\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n in \u1ea5n, ch\u1ec9nh s\u1eeda v\u00e0 sao ch\u00e9p n\u1ed9i dung trong t\u00e0i li\u1ec7u PDF. Ng\u01b0\u1eddi nh\u1eadn c\u00f3 th\u1ec3 m\u1edf t\u00e0i li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n m\u1eadt kh\u1ea9u.<\/li>\n<\/ul>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u?<\/h2>\n<p>B\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1eadt kh\u1ea9u \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u1ec7p PDF b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng Visual Paradigm Online.<\/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. Nh\u1ea5n n\u00fat Nh\u1eadp \u0111\u1ec3 nh\u1eadp t\u1ec7p PDF c\u1ee7a b\u1ea1n.<br \/>\n<img alt=\"\" class=\"alignnone size-full wp-image-10886\" decoding=\"async\" height=\"229\" loading=\"lazy\" sizes=\"auto, (max-width: 178px) 100vw, 178px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-103900-1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-103900-1.png 178w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-103900-1-117x150.png 117w\" width=\"178\"\/><\/p>\n<p id=\"VShYxxT\"><img alt=\"\" class=\"alignnone size-medium wp-image-10888\" decoding=\"async\" height=\"51\" loading=\"lazy\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-104752-1-300x51.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-104752-1-300x51.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-104752-1-150x26.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Screenshot-2022-10-18-104752-1.png 327w\" width=\"300\"\/><\/p>\n<\/li>\n<li>Sau khi nh\u1eadp t\u1ec7p xong, h\u00e3y truy c\u1eadp File, Thu\u1ed9c t\u00ednh, v\u00e0 ch\u1ecdn B\u1ea3o m\u1eadt, b\u1ea3o m\u1eadt t\u00e0i li\u1ec7u, \u0111\u1ec3 m\u1edf h\u1ed9p tho\u1ea1i c\u00e0i \u0111\u1eb7t b\u1ea3o m\u1eadt PDF.<br \/>\n<img class=\"alignnone wp-image-13373\" decoding=\"async\" height=\"524\" loading=\"lazy\" sizes=\"auto, (max-width: 489px) 100vw, 489px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-7.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-7.png 479w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-7-280x300.png 280w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-7-140x150.png 140w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-7-400x428.png 400w\" width=\"489\"\/><\/li>\n<li>Ch\u1ecdn Y\u00eau c\u1ea7u m\u1eadt kh\u1ea9u \u0111\u1ec3 m\u1edf t\u00e0i li\u1ec7u v\u00e0 x\u00e1c \u0111\u1ecbnh m\u1eadt kh\u1ea9u. Sau khi nh\u1eadp m\u1eadt kh\u1ea9u, nh\u1ea5n OK \u0111\u1ec3 \u0111\u00f3ng h\u1ed9p tho\u1ea1i.\n<p id=\"FezcDex\"><img class=\"alignnone wp-image-13377 size-full\" decoding=\"async\" height=\"571\" loading=\"lazy\" sizes=\"auto, (max-width: 828px) 100vw, 828px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8.png 828w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8-300x207.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8-768x530.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8-150x103.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-8-400x276.png 400w\" width=\"828\"\/><\/p>\n<\/li>\n<li>Sau \u0111\u00f3 l\u01b0u n\u00f3 v\u00e0o VP Online v\u00e0 xu\u1ea5t ra d\u01b0\u1edbi d\u1ea1ng t\u1ec7p PDF m\u1edbi.<br \/>\n<img class=\"alignnone wp-image-13378 size-full\" decoding=\"async\" height=\"306\" loading=\"lazy\" sizes=\"auto, (max-width: 588px) 100vw, 588px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-9.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-9.png 588w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-9-300x156.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-9-150x78.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-9-400x208.png 400w\" width=\"588\"\/><\/li>\n<li>B\u00e2y gi\u1edd t\u1ec7p PDF \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u b\u1ea1n \u0111\u00e3 ch\u1ec9 \u0111\u1ecbnh.<br \/>\n<img class=\"alignnone wp-image-13379 size-full\" decoding=\"async\" height=\"135\" loading=\"lazy\" sizes=\"auto, (max-width: 477px) 100vw, 477px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-10.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-10.png 477w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-10-300x85.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-10-150x42.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/09\/Pasted-10-400x113.png 400w\" width=\"477\"\/><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c t\u00e0i li\u1ec7u PDF b\u1eb1ng c\u00e1ch \u0111\u1eb7t m\u1eadt kh\u1ea9u v\u00e0 gi\u1edbi h\u1ea1n m\u1ed9t s\u1ed1 ch\u1ee9c n\u0103ng, ch\u1eb3ng h\u1ea1n nh\u01b0 in \u1ea5n v\u00e0 ch\u1ec9nh s\u1eeda. Trong video n\u00e0y, b\u1ea1n s\u1ebd th\u1ea5y c\u00e1ch s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 c\u1ee7a ch\u00fang t\u00f4i tr\u00ecnh ch\u1ec9nh s\u1eeda PDF mi\u1ec5n ph\u00ed tr\u1ef1c tuy\u1ebfn [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":11427,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-11426","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>B\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u - Visual Paradigm Blog<\/title>\n<meta name=\"description\" content=\"You can restrict access to PDFs by setting passwords. In this video, you can see how to specify a password for a PDF in VP Online.\" \/>\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\/password-protect-a-pdf\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u - Visual Paradigm Blog\" \/>\n<meta property=\"og:description\" content=\"You can restrict access to PDFs by setting passwords. 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