Cov ntawv xov xwm kev luam tawm nta ntawm PDF
Peb yog ib lub lag luam loj hauv Shenzhen Tuam Tshoj. Peb muaj cov phau ntawv luam tawm, phau ntawv nyuaj, phau ntawv luam ntawv, phau ntawv nyuaj, phau ntawv luam tawm, phau ntawv luam tawm, phau ntawv luam tawm, lub thawv ntim, daim qhia ntawv, txhua yam ntawm PVC, cov ntawv luam tawm, ntawv sau cia, hom tshwj xeeb ntawv xim luam tawm khoom, kev ua si cardand li ntawd.
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Postscript yog tsim rau luam publishing thiab yog kev lag luam ntawm de facto rau cov kev siv technology prepress: cov kev siv xov xwm multimedia raug tsim los rau kev kawm siab ntawm cov qauv ntawm PDF cov ntawv tawm tswv yim, yog li nws yog tsim rau luam publishing thiab cov hluav taws xob luam tawm: tom qab tshwm sim ntawm online publishing, PDF tseem pom nws tus kheej siv.
PDF los nrog nta uas ua tau raws cov kev cai ntawm kev luam tawm xov xwm, vim nws yog hauv paus hauv PostScript cov cuab yeej technology, txais txhua qhov txiaj ntsig ntawm kev siv tshuab, thiab txiav txim siab txog cov kev xav tau thiab cov nta hluav taws xob ntawm cov ntawv xov xwm. Tsis tas li ntawd, cov duab ntawm PostScript technology yog kev ua ke hauv cov ntawv PDF ua kom sib haum ntawm daim tawv luam tawm thiab qhov screen tso tawm.
Tom qab luam tawm tsab xov xwm xav tau kev tsim thiab ntau lawm, cov txiaj ntsig ntawm kev ua haujlwm yuav siv tau rau ntau hom kev tshaj tawm, uas yog, ib zaug siv ntau thiab siv ntau yam. Kev tshaj tawm hauv kev tshaj xov xwm kuj tseem xav kom cov ntsiab lus tsim kom muaj lub hom phiaj ntawm cov ntawv xov xwm, uas yog, qhov tsis muaj peev xwm raug teem rau ib qho kev tshaj tawm rau lub hom phiaj ntawm cov ntaubntawv povthawj siv thiab xov xwm siv hauv cov ntawv xovxwm.
Ua ntej, luam tawm tsab xov xwm thiab nws cov kev cai yooj yim
Cov haujlwm tseem ceeb ntawm kev luam tawm tsab xov xwm tuaj yeem sau tau ua "kev ua, kev siv thiab cia cov ntaub ntawv muaj peev xwm hloov tau txhua yam tawm ntawm cov ntaub ntawv", thiab qhov kev ua haujlwm no kuj siv tau los txhais cov ntsiab lus ntawm cov ntawv xov xwm.
Raws li tau pom los ntawm cov lus txhais ntawm cov ntawv xov xwm, nws tsis yog nthuav qhia cov ntsiab lus thiab kev sib raug zoo ntawm cov ntawv xov xwm thiab cov luam digital, tab sis kuj qhia txog cov kev xav tau ntawm cov kev xav tau los ntawm cov ntawv luam tawm thiab cov ntawv tshaj tawm hauv xov tooj: Nws tseem qhia txog kev siv lub tswvyim ntawm cov tswvyim no, uas yog, kev xav txog kev sib txuas lus yog qhov yuav tsum tau muaj rau kev siv cov ntawv tshaj tawm, kev luam thiab cov ntawv luam tawm hauv lub web. Cross-media publishing yuav tsum tsim kom muaj cov neeg tsim muaj cov ntsiab lus yooj yim.
1. Kev tsim kho cov yam ntxwv ntawm cov ntsiab lus
Tom qab cov ntsiab lus tsim, nws yuav tsum tau ua tiav. Lub tswv yim ntawm qhov kev tshaj tawm hauv tshuab hluav taws xob tau txo cov kev txawj ntse rau cov tswv lag luam, thiab ntau ntau tus neeg koom nrog cov ntaub ntawv luam, tab sis muaj kev to taub txog qhov teeb meem tseem ceeb ntawm kev sib txawv ntawm kev tsim thiab kev ua tiav. Kev tsim thiab kev tsim khoom tsuas yog kev ua haujlwm ua ntej kom tiav cov kev tshaj tawm ntawm cov ntsiab lus. Thaum lub sijhawm no, nws tsis tas yuav coj los siv rau hauv kev siv cov ntsiab lus thiab cov ntaubntawv povthawj siv nruab nrab, tiamsis nws tsis tsim nyog yuav tsis pom qhov tseem ceeb ntawm qhov kawg. Tom qab tsim thiab ua tiav tiav lawm, nws yuav tsum tau tsom mus rau cov kev qhia tawm tshwj xeeb thiab raws li cov ntaubntawv povthawj siv tshuab thiab nruab nrab nruab nrab los siv. Txoj kev no yog hu ua qhov xaus. Tom qab qhov kev xav ntawm tus ntoo khaub lig tau muab tso rau yav tom ntej, qhov xaus yuav yog qhov tseem ceeb.
Kev ua cov ntsiab lus tseem ceeb rau kev luam txoj haujlwm yog ib qho piv txwv, cov nplooj ntawv yuav tsum muaj cov kev ua haujlwm coj los tsim kev qhia txog kev siv cov ntawv xov xwm, ink, printer, thiab cov txheej txheem luam ntawv. Piv txwv li, nplooj ntawv tam sim no yuav tsum tau hloov mus rau CMYK xim qhov chaw hauv lwm qhov chaw xim (cov txheej txheem no tseem hu ua xim sib cais hauv cov txheej txheem digital), thiaj li tsim nyog kom tsis muaj kev cuam tshuam ntawm cov xovxwm luam thiab cov ntawv phaj, nyob rau hauv tsis muaj tseeb overprinting Cov ntsiab lus yog kom tau compensation rau cov txheej txheem tov. Rau cov kev xav tau zoo thiab kev luam ntawm cov teeb meem luam tawm, cov kev ntsuas tsis zoo yuav tsum raug xaiv, thiab tom lub cim, qhov kos cim, lub teeb liab, thiab lwm yam ntxiv yuav tsum tau ntxiv rau nplooj ntawv tshwj xeeb los pab txhawb cov ntawv xov xwm phaj, txiav thiab tswj kev luam ntawv zoo, thiab lwm yam.
2. hloov
Txhua yam nyob hauv lub ntiaj teb yog nyob rau hauv nruab nrab ntawm txoj kev loj hlob thiab kev hloov, thiab cov neeg siv yuav tsum hloov. Tsis tas li ntawd, nws tsis tuaj yeem tsim thiab tsim cov ntsiab lus zoo uas tsis muaj teeb meem, xws li yuam kev hauv cov tswv yim ntawv, cov teeb meem hauv cov duab, thiab lwm yam. Rau qhov kawg no, tsab ntawv xov xwm tshaj tawm yuav tsum muab cov ntsiab lus zoo tsim kho thiab kho ua ntej tso tawm kom txo cov kev poob qis thiab tsim cov kev mob zoo rau cov ntawv tshaj tawm hauv xov xwm.
3. Kev hloov cov ntaub ntawv
Cov txheej txheem nthuav tawm cov txheej txheem rau tag nrho cov cuab yeej siv digital thiab digital technologies muaj ntau txoj cai rau cov ntaub ntawv tawm thaum luam tawm, nyob ntawm cov ntaub ntawv nruab nrab cov ntaub ntawv thiab hom kev tshaj tawm ntawm kev tshaj tawm. Yog li no, cov ntsiab lus yuav tsum tau ua kom tiav raws li xav tau tom qab cov ntsiab lus tsim. Piv txwv, cov ntaub ntawv luam tawm thiab luam tawm yog hloov dua siab tshiab rau PostScript, EPS lossis PDF, thiab cov ntaub ntawv rau web publishing yog hloov dua siab tshiab rau HTML hom ntawv.
Los ntawm cov lus teev tseg saum toj saud-saum cov lus sau tseg rau kev sib txuas lus, kev siv txoj cai ntawm kev sib txuas lus tsis txaus los ntawm cov khoom siv hluav taws xob. Nws hu rau cov kev tawm tswv yim tshiab, xws li Adobe txoj kev loj hlob zoo raws li PostScript Level3 thiab PDF tshuab. SUPRA qauv.
Thib ob, PDF yog tsim rau tus yam ntxwv ntawm cov ntawv sau luam tawm
Cov cwj pwm ntawm PDF tsim rau luam publishing tau raug muab faib ua ob yam: ib qho yog qhov tseem hais tias nws tseem txhawb nqa prepress thiab print workflows, thiab lwm qhov yog tias txhua nplooj ntawv piav qhia PDF yog ib leeg ywj siab.
1. Qhov tseem ceeb ntawm nplooj ntawv sab nrauv
Lub cev, cov ntaub ntawv PootScript piav qhia cov nplooj ntawv sib txuas nrog. Lawv raug npaj ua raws li cov ntsiab lus ntawm daim ntawv tshaj tawm. Tom qab tso zis rau ntawm ib hom khoom ntaus ntawv, ib qho ua tiav nrawm ntawm nplooj ntawv tau txais. Cov nplooj ntawv no muaj kev sib raug zoo, sib raug zoo lossis kev sib raug zoo. Nyob rau hauv cov qauv ntaub ntawv, txhua PostScript cov ntaub ntawv yog ua tau ntawm cov ntawv qhia tom qab kawm PostScript, uas muab faib ua lub ntsiab lus thiab kev piav qhia. Cov lus piav qhia yog hais txog qhov kev piav qhia ntawm qhov khoom. Nws yog vim qhov no tias nws yog ib qhov ua tau los tsim cov khoom thiab yam khoom. Thiab cov khoom qhov tseeb ntawm qhov khoom ua rau qhov tseeb ntawm cov nplooj ntawv, vim hais tias cov khoom muaj feem xyuam nyob rau hauv cov nplooj ntawv sib txawv.
Qhov teeb meem loj tshaj plaws ntawm nplooj ntawv correlation yog tias nws yog qhov yuam kev-nws thaum tawm kev tawm. Piv txwv li, thaum RIP txhais ib yam khoom ntawm nplooj ntawv 5 thiab pom tias nws muaj feem xyuam nrog cov khoom nyob rau nplooj 2, ces RIP yuav dhia mus rau qhov thib ob. Page, reinterpret tus kwv thiab rov qab mus rau nplooj 5. Yog tias koj tsuas xav rov los txhais nws ib zaug, qhov teeb meem tsis loj dhau, thiab nws yog ib qhov pov tseg ntawm lub sijhawm. Tab sis qhov teeb meem yog tias ib yam khoom muaj feem xyuam yuav raug txhais dua tom qab tau tshaj tawm lawm, yog li ntawm kev rov txhais dua yog ntau qhov kev txhais ntawm kev txhais lus, uas ua rau kev tso tawm ntawm PostScript. Tus neeg txhais lus hais txog qhov lus yuam kev yuam kev los yog kev yuam kev tsis txaus.
Qhov sib txawv ntawm PDF thiab PostScript yog qhov RDF yog ib daim ntawv ntaus ntawv, tsis yog cov lus piav qhia. Txawm hais tias nws kuj qhia txog cov khoom, cov nplooj ntawv tsis muaj feem xyuam nrog cov nplooj ntawv vim tias tsis muaj cov txheej txheem programming. Yog li, tom qab daim ntawv thov uas tsim cov ntaub ntawv PDF
Tom qab Acrobat Distiller "distilled", nplooj ntawv qhov tseeb ntawm nplooj ntawv tau txiav tawm. Nws tuaj yeem pom tias cov nplooj ntawv tsis tseem ceeb ua kom tsim nyog rau kev luam tawm tsab xov xwm, thiab siv tau los luam tawm publishing, electronic publishing los yog web publishing tsis tau ua dua ntxiv.
2. Ua luam tawm cov ntawv PDF
Vim tias PDF yog raws li Kev Tshawb Fawb PostScript, nws yuav tsum yog qhov tsis txaus siab rau kev sau luam tawm. Txawm li cas los xij, cov PDF hom ntawv tsuas yog muab cov ntaub ntawv luam tawm me ntsis xwb thaum pib ntawm nws lub sijhawm, thiab nws tau los ua zoo tagnrho txog thaum tso tawm ntawm Acrobat 3.0. Xaiv qhov luam tawm cov ntawv luam ntawm PDF tau muab los tham nyob rau hauv ntau cov ntawv, nws tsis yog yuav tsum tau tham txog ntau yam ntawm no. Muab tso ua ke, PDF kev txhawb nqa luam tawm yog:
(1) PDF, xws li PostScript, ua cov khoom siv ib txoj kev zoo sib xws rau cov txheej txheem luam ntawv (template coloring), uas yog tus yeeb yam tseem ceeb ntawm PDF:
(2) Pib nrog version 1.2, PDFs pib txhawb CMYK xim nrug, uas yuav tsum tau luam luam luam tawm:
(3) Txhua PostScript cov ntaub ntawv los yog EPS ntaub ntawv yeej ib txwm ntsig txog nplooj ntawv. Qhov no yog lub ntsiab tseem ceeb uas cov PS lossis EPS ua haujlwm raws li cov ntaub ntawv feem ntau ua rau cov kev txwv tsis raug lossis yuam kev qeeb, tab sis thaum cov ntaub ntawv PS lossis EPS hloov mus rau Tom qab ntawv PDF, nplooj ntawv qhov tseeb raug txiav tawm, kom ntseeg tau tias txhua PDF nplooj yuav muab tso tawm stably:
(4) Kev Txhawb Kev Tshawb Pom Kev Tshawb Fawb (QPI) kom ua tiav cov duab hauv high-resolution hloov, vim cov duab siv luam tawm los ntawm kev luam feem ntau muaj cov ntsiab lus qis dua thiab kev kho lub suab, yog li cov ntaub ntawv duab. Lub peev xwm cia yog loj heev. Yuav kom txo tau lub nra ntawm "tuav", nws yog ib qhov tsim nyog yuav tau siv cov duab qis tsis sib npaug hauv cov typesetting, thiab hloov cov duab nrog cov duab siab thaum daws teeb meem:
(5) Kev txhawb txoj kev siv tshuab ua kom yooj yim, tag nrho cov ntawv yuav tsum tau muab tso rau hauv daim ntawv sau tawm tau rau ntawm nplooj ntawv;
(6) Txhawb kev daws teeb meem los daws qhov teeb meem uas cov khoom siv rau kev luam tawm yuav tshwm sim tau "dawb" ntawm ntug qhov khoom vim qhov tsis muaj tseeb;
(7) Built-in digital screening algorithm, uas tso cai tsis xws li teev cov qauv, voj voog npo thiab ntsuas lub voj voos uas yuav tsum tau sau tseg rau ntau yam kev cai tshaj tawm thiab kev luam ntawv zoo;
(8) Txhawb txoj kev clipping, yog li ntawd txoj kev ua rau txoj kab tiav hauv cov duab ua software siv tau los ua tus ciam ntawm cov ntawv nyeem;
(9) Txhawb kom siv cov duab sib txig sib luag los ua cov duab monochrome nrog ntau cov khaubncaws sab nraud povtseg ntawm lwm tus lej, tsim rau kev luam cov duab zoo nkauj ntawm cov duab thaij duab;
(10) Kev them nyiaj yug xim sib cais xim qhov chaw kom yooj yim ntawm kev hloov los ntawm lwm cov duab hom rau CMYK hom;
(11) Kev muab ib qho cim, ib qho cim, ib lub voj voos lossis ib lub nplhaib ntawm nplooj ntawv, uas ua rau cov ntawv luam tawm ntawm lub phaj ua ntej luam ntawv, kuaj xyuas qhov tseeb, thiab xyuas qhov zoo ntawm cov ntawv luam tawm.
Lub functions ntawm PDF txhawb rau luam publishing tseem yuav hais, tab sis lub ntsiab txheem yog teev saum toj no.
Thib peb, PDF cov ntawv luam tawm thiab cov txheej txheem hauv online
PDF hom ntawv yog tsim los coj los rau hauv koj tus account cov kev xav tau ntawm electronic publishing, thiab cov kev ua haujlwm siv rau kev tshaj tawm hauv electronic publishing tseem ceeb sib luag rau hauv online publishing vim tias tsis muaj lub ntsiab ntawm cov luam ntawv thiab kev tshaj tawm hauv online.
Kev txhawb nqa PDF rau kev luam tshaj tawm tau pom ntau qhov chaw. Cov ntsiab lus tseem ceeb xaiv hauv qab no.
1. Siv tshuab hluav taws xob kom tsim nyog rau electronic publishing thiab web publishing
PDF siv industry-standard compression algorithms xws li JPEG, LZW, CCITTGroup3, CCITTGroup4, Phaj thiab khiav ntev encoding, etc., yuav txawm compress embedded audio data. Neeg siv Distiller los ua cov ntaub ntawv PDF tuaj yeem sau nrog txoj kev sib txuam sib txawv rau cov khoom sib txawv ntawm nplooj ntawv, yog li kom ntseeg tau tias cov ntaub ntawv PDF yeej ib txwm hnav, yoog raws thiab txav tau. Qhov yuav txo tau hauv PDF cov ntaub ntawv cia yuav tsum qhia qhov tseeb tias nws yog tsim rau ob qho tib si hlawv ntawm ib lub disc thiab kev xa mus rau ib lub network.
2. Ua haujlwm txuas kev kub ntxhov
PDF txhawb kev hypertext thiab hypermedia links, thiab ib yam khoom ntawm nplooj ntawv tuaj yeem txuas rau lwm tus khoom raws li xav tau. Peb paub tias hypertext links yog ib qho ntawm cov qauv kev siv ntau yam hauv cov ntawv luam tawm hauv digital thiab yog vim li ntawd cov cim tseem ceeb los ntsuas seb cov PDFs puas muaj peev xwm tshaj tawm hauv xov xwm. Cov ntsiab lus hypertext lossis kev sib nkag siab txog hypermedia yog guaranteed PDF ntaub ntawv tuaj yeem nyeem hauv ib txoj kab uas tsis yog-linear thaum tso tawm kom pom ntawm lub computer monitor screen. Cov neeg siv tuaj yeem nkag rau cov ntsiab lus uas yog txhaj rau cov ntawv nyeem lossis lwm yam khoom uas tau sau nrog cov kev sib txuas lossis kev sib txuas lus, thiab rov tuaj rau qhov chaw qub thaum twg los tau.
3. Yam khoom siv ntiag tug ntaus ntawv ywj pheej
Txhua PDF ntawv tau piav nyob rau hauv ib qho cuab yeej-ywj siab. Nyob rau hauv txoj kev no, txhua PDF ntawv tuaj yeem ua rau nyias lub computer platforms (xws li kev siv computers thiab workstations) thiab ntau lub computer operating systems (piv txwv li Hauv Ubno, Mac QS, thiab UNIX operating systems, thiab uas qhia tau zoo ibyam, yog qhov yuav tsum muaj rau kev luam tawm xov xwm.
4. Cov ntawv sau tseg thiab cov lus qhia ntxiv
Bookmarks, annotations, thiab annotations yuav muab ntxiv rau cov ntaub ntawv PDF. Qhov no yooj yim rau cov neeg uas nyeem PDFs ntawm computer screen, lub ntsiab lus tias cov nyeem ntawv tuaj yeem txwv tsis pub nyeem ntawv txhua lub sijhawm thiab xa rov mus rau lawv qhov chaw nyob thaum twg xav tau. Tsis tas li ntawd, tus nyeem ntawv tuaj yeem ceev cov ntaub ntawv hais txog kev nyeem ntawv tam sim no, thiab sau cov kev nyeem ntawv raws sij hawm.
5. Tshaj tawm ntawm kev daws teeb meem
Kev daws teeb meem ntawm cov nplooj ntawv yog cov cuab yeej-ywj siab, uas yog, txawm tias nws yog cov duab, cov ntawv nyeem lossis cov duab, tsis tas yuav xav txog qhov kev daws teeb meem thaum piav txog lawv, thiab tsuas yog yuav tsum tau txiav txim siab thaum txiav tawm. No feature muab kev txhawb rau electronic publishing thiab web publishing, lub ntsiab lus tias cov ntaub ntawv PDF tuaj yeem tso tawm rau txhua yam khoom ntaus ntawv.
6. Txhawb nqa cov ntsiab lus multimedia
Txhawb nqa ntau hom khoom xws li audio, video, thiab animation nyob rau sab ntawv, thiab cov khoom siv ntau yam yuav tsum tau siv lub tshuab ua kom yuam kev yooj yim. Yog li no PDF Cov hom ntawv kuj siv tau rau cov ntawv tshaj tawm hauv xov xwm hauv multimedia thiab tsis txwv cov ntawv luam tawm. Cov PDF tau kos cov duab ntau hauv cov ntaub ntawv, los yog muaj peev xwm tsim tau tus pointer rau cov ntaub ntawv siv ntau hom ntaub ntawv tsis muaj qhov ua daim ntawv. Nyob rau lub sij hawm no, thaum tus nyeem ntawv xav ua si ntau hom khoom siv, ntau daim ntawv thov hu ua multimedia hu ua multimedia khoom los ua si.
7. Kev tshwm sim hauv nas
Daim ntawv PDF ntawv txhawb cov lus teb rau cov xwm txheej ntawm tus nas. Thaum cov ntawv tshaj tawm hauv xov tooj los yog tus neeg sau ntawv hauv xov xwm ua rau muaj kev nqis tes ua rau nas, daim ntawv thov PDF yuav cuam tshuam cov kev tshwm sim uas muaj los ntawm qhov kev txiav txim thiab pib muaj kev sib raug zoo nrog cov khoom siv ntau yam khoom. Tus software tsim rau ntau hom xov xwm ua yeeb yam hauv cov ntsiab lus multimedia hauv PDF.
8. Nyeem cov ntaub ntawv PDF
Yuav kom txhawb tau PDF daim ntawv hom, Adobe tau txais ib lub tswv yim tsim nyog, thiab lub tuam txhab muab PDF ntaub ntawv nyeem ntawv software rau cov neeg siv PDF cov ntaub ntawv pub dawb. Acrobat nyeem ntawv tso cai rau cov neeg siv mus download tau qhov tseeb version ntawm lub software los ntawm lub tuam txhab lub vas sab hauv Internet. Thaum siv, cov nyeem tau nyeem PDF cov ntaub ntawv ncaj qha rau ntawm qhov screen thiab luam tawm rau ntawm ib daim ntawv ntaus khoom txuas nrog lub computer thaum xav tau. Li no, nyeem tau tawm PDF cov ntaub ntawv ntawm ib lub tshuab luam ntawv tsis tu ncua tsis tau yuav khoom PostScript kho vajtse.
9. Cov ntaub ntawv PDF
Lub ntsiab txoj hauv kev los tsim cov ntaub ntawv PDF yog siv Acrobat Dstiller, tab sis koj tuaj yeem tsim cov ntaub ntawv PDF hauv cov ntawv sib txawv. Tam sim no muaj ntau software tsim nyob rau hauv no muaj nuj nqi, piv txwv li
IIIustrator, CorelDRAW, Photoshop, PageMaker thiab FreeHand. Ntxiv thiab, yog Acrobat 4.0 yog ntsia rau ntawm tus neeg siv qhov system los yog 5.0, koj tuaj yeem siv PDF hauv Microsoft Word 97 lossis 2000, Excel 97 lossis 2000, thiab PowerPoint 97 lossis 2000. Txiag hloov cov ntawv tam sim no nrog rau PDF.
10. PDF qhov muag software encryption complies nrog copyright tiv thaiv cov kev cai
Cov txheej txheem encryption uas tau muab los ntawm PDF hom muaj cov nram qab no: ib daim ntawv muaj ob lo lus password, ib tug yog tus password ntawm tus tswv ntawm daim ntawv (tus creator ntawm daim ntawv PDF), thiab lwm qhov yog tus password ntawm tus neeg siv tus neeg siv ntawm daim ntawv pov thawj PD). Ib daim ntawv kuj qhia txog cov kev txwv uas yuav tsum tau txwv txawm hais tias cov ntaub ntawv tau muab kho dua, nrog rau kev luam ntawv, luam ntawv thiab cov ntawv tawm hauv daim ntawv, hloov cov ntaub ntawv, thiab ntxiv lossis hloov cov ntawv sau tawm. Tom qab tus neeg siv nkag password nkag, daim ntawv PDF qhib thiab kho dua, tab sis cov haujlwm ua haujlwm no tseem siv tau: txhua txoj haujlwm tsuas yog tso cai tom qab tus tswv ntawm tus ntawv nkag rau PDF. Tus tswv ntawm tus tswv yuav tsum tau hloov tus password, txuas tus neeg siv (password), thiab tshem tawm kev txwv. Seb nws yog tus neeg siv tus password, tus tswv ntawm tus tswv, lossis kev txwv kev ua haujlwm ntawm daim ntawv, daim ntawv ntxiv rau daim ntawv. Txawm li cas los xij, tsuas yog thaum ib daim ntawv muaj ib tus neeg siv tus password, tus neeg siv tau txais kev tso cai nkag mus rau tus neeg siv tus password thaum daim ntawv qhib.