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37.
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If you click <menuchoice><guimenu>Applications</guimenu><guisubmenu>System</guisubmenu><guimenuitem>Software Sources</guimenuitem></menuchoice> and select the <guilabel>Updates</guilabel> tab, you will notice that four update sources are available. An explanation for each of these is provided below:
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:219(para)
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38.
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<emphasis role="strong">Important security updates:</emphasis> Updates which fix critical security flaws are made available through this source. It is recommended that all users leave this source enabled (it should be enabled by default).
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:227(para)
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39.
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<emphasis role="strong">Recommended updates:</emphasis> Updates which fix serious software problems (which are not security flaws) are made available through this source. Most users will want to leave this source enabled as common and annoying problems are often fixed with these updates.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:235(para)
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40.
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<emphasis role="strong">Pre-released updates:</emphasis> Updates which are currently being tested before being released to everyone are provided through this update source. If you would like to help test new updates (and get fixes for problems more quickly), enable this source. Be aware that these updates may not yet be well tested; it is not recommended that you enable this source unless you are prepared to experience occasional problems.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:244(para)
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41.
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<emphasis role="strong">Unsupported updates:</emphasis> When new versions of popular software are released they are sometimes <quote>back-ported</quote> to an older version of Xubuntu so that users can benefit from new features and fixes for problems. These backports are unsupported, may cause problems when installed and should only be used by people who are in desperate need of a new version of a software package which they know has been backported.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:255(para)
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42.
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Restricted and non-free software
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:271(title)
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43.
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Most of the software available for Xubuntu is free, open-source software. This software is free for anyone to install and use, and people can modify the software and redistribute it if they like. Xubuntu is built from this type of software.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:272(para)
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44.
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<emphasis role="strong">Non-free software</emphasis> is software which is not freely redistributable or modifiable. This makes it difficult for the Xubuntu developers to improve the software and correct problems, so it is normally recommended that you use <ulink url="http://www.ubuntu.com/ubuntu/philosophy"> free software</ulink> instead.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:278(para)
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45.
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<emphasis role="strong">Restricted software</emphasis> is software which has restrictions on its use, preventing it from being classed as free software. Non-free software is a type of restricted software, where the restrictions are due to the software having a non-free license. Other reasons for software being classed as restricted include legal issues (use of some types of software is illegal in some countries) and patent issues (some software requires a patent license to be used legally).
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<emphasis role="strong">制限付きソフトウェア（Restricted software）</emphasis>とは利用に際して制限があり、フリーソフトウェアに分類することができないソフトウェアです。自由でないソフトウェアは制限付きソフトウェアの一種で、自由でないライセンスを持っているがために制限があると判断されています。他に制限付きと分類される理由としては、法律的な問題（一部の国では使用すると法律に触れてしまうなど）がある場合や、特許の問題（合法的に使用するためには特許料を支払わなければならない）がある場合などが考えられます。
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Translated and reviewed by
Shigeru KOBAYASHI
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Located in
add-applications/C/add-applications.xml:285(para)
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46.
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In some cases, restricted software is the only option. Such cases include software for the playback of certain audio and video formats, some fonts and <link linkend="restricted-manager"><application>drivers for some graphics cards</application></link>.
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(no translation yet)
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Located in
add-applications/C/add-applications.xml:294(para)
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