{"id":11402,"date":"2026-01-10T13:41:59","date_gmt":"2026-01-10T05:41:59","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/vn\/how-to-protect-a-pdf-with-password\/"},"modified":"2026-01-10T13:41:59","modified_gmt":"2026-01-10T05:41:59","slug":"how-to-protect-a-pdf-with-password","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/vn\/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>B\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9nh s\u1eeda t\u00e0i li\u1ec7u PDF tr\u1ef1c tuy\u1ebfn v\u1edbi Visual Paradigm Online. D\u00f9 l\u00e0 c\u00e1 nh\u00e2n hay doanh nghi\u1ec7p quy m\u00f4 l\u1edbn nh\u1ecf, vi\u1ec7c s\u1eed d\u1ee5ng r\u1ea5t \u0111\u01a1n gi\u1ea3n. B\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh trong b\u1ea5t k\u1ef3 t\u1ec7p PDF n\u00e0o m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 d\u1ec5 d\u00e0ng nh\u1edd c\u00f4ng c\u1ee5 ch\u1ec9nh s\u1eeda PDF k\u00e9o th\u1ea3 mi\u1ec5n ph\u00ed tr\u1ef1c tuy\u1ebfn. N\u1ed9i dung v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh trong t\u00e0i li\u1ec7u PDF c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ec9nh s\u1eeda, c\u00e1c t\u00f9y ch\u1ecdn ph\u00f4ng ch\u1eef c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i, v\u00e0 n\u1ed9i dung b\u1ed5 sung nh\u01b0 video, \u1ea3nh v\u00e0 hi\u1ec7u \u1ee9ng ho\u1ea1t h\u00ecnh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o. H\u01a1n n\u1eefa, n\u1ebfu b\u1ea1n c\u1ea7n b\u1ea3o m\u1eadt cho t\u00e0i li\u1ec7u PDF c\u1ee7a m\u00ecnh, b\u1ea1n c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u trong VP Online m\u00e0 kh\u00f4ng c\u1ea7n d\u00f9ng tr\u00ecnh ch\u1ec9nh s\u1eeda PDF. \u0110\u00e2y l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn nhanh gi\u00fap b\u1ea1n h\u1ecdc c\u00e1ch th\u00eam m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng b\u1eb1ng c\u00f4ng c\u1ee5 c\u1ee7a ch\u00fang t\u00f4i. B\u1ea1n c\u00f3 th\u1ec3 xem video \u0111\u00ednh k\u00e8m ho\u1eb7c \u0111\u1ecdc h\u01b0\u1edbng d\u1eabn b\u00ean d\u01b0\u1edbi.<\/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=\"980\" data-skipgform_ajax_framebjll=\"\" height=\"480\" id=\"_ytid_73798\" loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/HFQyuF21Ec4?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=\"980\"><\/iframe><\/div>\n<h2>Ch\u1ecdn t\u00e0i li\u1ec7u PDF<\/h2>\n<p>Tr\u01b0\u1edbc ti\u00ean, sau khi \u0111\u0103ng nh\u1eadp v\u00e0o Visual Paradigm Online, b\u1ea1n s\u1ebd \u0111\u1ebfn kh\u00f4ng gian l\u00e0m vi\u1ec7c c\u1ee7a m\u00ecnh tr\u00ean VP Online. B\u1ea1n c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0o B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 ch\u1ecdn \u1ee8ng d\u1ee5ng &#8211; PDF. Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p v\u00e0o n\u00fat PDF \u0111\u1ec3 nh\u1eadp t\u00e0i li\u1ec7u PDF t\u1eeb thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16089 size-full\" decoding=\"async\" height=\"305\" loading=\"lazy\" sizes=\"auto, (max-width: 434px) 100vw, 434px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/1.png 434w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/1-300x211.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/1-150x105.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/1-400x281.png 400w\" width=\"434\"\/><\/p>\n<h2>Ch\u1ecdn b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF<\/h2>\n<p>Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p v\u00e0o n\u00fat c\u00f4ng c\u1ee5, v\u00e0 m\u1ed9t danh s\u00e1ch c\u00e1c ch\u1ee9c n\u0103ng li\u00ean quan \u0111\u1ebfn PDF s\u1ebd xu\u1ea5t hi\u1ec7n. Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn B\u1ea3o v\u1ec7 PDF \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00e0i li\u1ec7u PDF b\u1eb1ng m\u1eadt kh\u1ea9u tr\u00ean VP Online.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16090 size-full\" decoding=\"async\" height=\"504\" loading=\"lazy\" sizes=\"auto, (max-width: 751px) 100vw, 751px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/2.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/2.png 751w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/2-300x201.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/2-150x101.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/2-400x268.png 400w\" width=\"751\"\/><\/p>\n<h2>Ch\u1ecdn t\u1ec7p PDF c\u1ee7a b\u1ea1n<\/h2>\n<p>Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p v\u00e0o n\u00fat ch\u1ecdn t\u1ec7p \u0111\u1ec3 t\u1ea3i l\u00ean t\u1ec7p PDF c\u1ee7a m\u00ecnh. C\u1eeda s\u1ed5 thi\u1ebft b\u1ecb s\u1ebd t\u1ef1 \u0111\u1ed9ng xu\u1ea5t hi\u1ec7n v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn t\u1ec7p PDF tr\u00ean thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 k\u00e9o v\u00e0 th\u1ea3 t\u1ec7p PDF c\u1ee7a m\u00ecnh v\u00e0o khu v\u1ef1c l\u00e0m vi\u1ec7c. Vi\u1ec7c t\u1ea3i l\u00ean t\u1ec7p c\u1ee7a b\u1ea1n r\u1ea5t nhanh v\u00e0 d\u1ec5 d\u00e0ng.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16091 size-full\" decoding=\"async\" height=\"538\" loading=\"lazy\" sizes=\"auto, (max-width: 911px) 100vw, 911px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3.png 911w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3-300x177.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3-768x454.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3-150x89.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/3-400x236.png 400w\" width=\"911\"\/><\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16092 size-full\" decoding=\"async\" height=\"466\" loading=\"lazy\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/4.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/4.png 595w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/4-300x235.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/4-150x117.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/4-400x313.png 400w\" width=\"595\"\/><\/p>\n<h2>X\u00e1c \u0111\u1ecbnh m\u1eadt kh\u1ea9u<\/h2>\n<p>Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 nh\u1eadp m\u1eadt kh\u1ea9u ri\u00eang c\u1ee7a m\u00ecnh v\u00e0o \u00f4 tr\u1ed1ng b\u00ean d\u01b0\u1edbi. B\u1ea1n c\u1ea7n \u0111i\u1ec1n m\u1eadt kh\u1ea9u hai l\u1ea7n v\u00e0o \u00f4 &#8216;M\u1eadt kh\u1ea9u&#8217; v\u00e0 \u00f4 &#8216;X\u00e1c nh\u1eadn m\u1eadt kh\u1ea9u&#8217;. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o m\u1eadt kh\u1ea9u c\u1ee7a b\u1ea1n cho t\u00e0i li\u1ec7u PDF l\u00e0 ch\u00ednh x\u00e1c. Sau khi \u0111i\u1ec1n m\u1eadt kh\u1ea9u, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p v\u00e0o n\u00fat B\u1ea3o v\u1ec7 \u0111\u1ec3 x\u00e1c nh\u1eadn vi\u1ec7c th\u00eam m\u1eadt kh\u1ea9u.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16093 size-full\" decoding=\"async\" height=\"442\" loading=\"lazy\" sizes=\"auto, (max-width: 578px) 100vw, 578px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/5.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/5.png 578w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/5-300x229.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/5-150x115.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/5-400x306.png 400w\" width=\"578\"\/><\/p>\n<h2>\u0110\u1ed5i t\u00ean t\u1ec7p PDF c\u1ee7a b\u1ea1n<\/h2>\n<p>Sau khi th\u00eam m\u1eadt kh\u1ea9u cho t\u00e0i li\u1ec7u PDF \u0111\u00e3 t\u1ea3i l\u00ean, b\u1ea1n \u0111\u01b0\u1ee3c ph\u00e9p thay \u0111\u1ed5i t\u00ean c\u1ee7a t\u00e0i li\u1ec7u PDF \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7. Cu\u1ed1i c\u00f9ng, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea3i xu\u1ed1ng t\u00e0i li\u1ec7u PDF \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 tr\u00ean Visual Paradigm Online. Sau khi t\u1ea3i xu\u1ed1ng t\u00e0i li\u1ec7u PDF \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea5p \u0111\u1ec3 m\u1edf t\u1ec7p PDF. B\u00e2y gi\u1edd, m\u1eadt kh\u1ea9u s\u1ebd \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u m\u1ed7i khi b\u1ea1n mu\u1ed1n \u0111\u1ecdc n\u1ed9i dung c\u1ee7a t\u00e0i li\u1ec7u PDF.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16094 size-full\" decoding=\"async\" height=\"440\" loading=\"lazy\" sizes=\"auto, (max-width: 796px) 100vw, 796px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7.png 796w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7-300x166.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7-768x425.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7-150x83.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/7-400x221.png 400w\" width=\"796\"\/><\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-16095 size-full\" decoding=\"async\" height=\"426\" loading=\"lazy\" sizes=\"auto, (max-width: 696px) 100vw, 696px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/8.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/8.png 696w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/8-300x184.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/8-150x92.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/11\/8-400x245.png 400w\" width=\"696\"\/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9nh s\u1eeda t\u00e0i li\u1ec7u PDF tr\u1ef1c tuy\u1ebfn v\u1edbi Visual Paradigm Online. D\u00f9 l\u00e0 c\u00e1 nh\u00e2n hay doanh nghi\u1ec7p quy m\u00f4 l\u1edbn nh\u1ecf, vi\u1ec7c s\u1eed d\u1ee5ng r\u1ea5t \u0111\u01a1n gi\u1ea3n. B\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i v\u0103n b\u1ea3n v\u00e0 h\u00ecnh \u1ea3nh trong b\u1ea5t k\u1ef3 t\u1ec7p PDF n\u00e0o m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 d\u1ec5 d\u00e0ng nh\u1edd [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":11403,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-11402","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 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 now edit your PDFs online with Visual Paradigm Online. 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