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36 <h1 class="SECT1"><a name="GENERAL" id="GENERAL">1. General
39 <h3 class="SECT2"><a name="WHO-USES" id="WHO-USES">1.1. Who should give
40 <span class="APPLICATION">Privoxy</span> a try?</a></h3>
41 <p>Anyone who is interested in security, privacy, or in finer-grained
42 control over their web and Internet experience.</p>
45 <h3 class="SECT2"><a name="BESTCHOICE" id="BESTCHOICE">1.2. Is Privoxy
46 the best choice for me?</a></h3>
47 <p><span class="APPLICATION">Privoxy</span> is certainly a good choice,
48 especially for those who want more control and security. Those with the
49 willingness to read the documentation and the ability to fine-tune
50 their installation will benefit the most.</p>
51 <p>One of <span class="APPLICATION">Privoxy's</span> strengths is that
52 it is highly configurable giving you the ability to completely
53 personalize your installation. Being familiar with, or at least having
54 an interest in learning about <a href=
55 "http://en.wikipedia.org/wiki/Http" target="_top">HTTP</a> and other
56 networking protocols, <a href="http://en.wikipedia.org/wiki/Html"
57 target="_top">HTML</a>, and <a href=
58 "http://en.wikipedia.org/wiki/Regular_expressions" target=
59 "_top"><span class="QUOTE">"Regular Expressions"</span></a> will be a
60 big plus and will help you get the most out of <span class=
61 "APPLICATION">Privoxy</span>. A new installation just includes a very
62 basic configuration. The user should take this as a starting point
63 only, and enhance it as he or she sees fit. In fact, the user is
64 encouraged, and expected to, fine-tune the configuration.</p>
65 <p>Much of <span class="APPLICATION">Privoxy's</span> configuration can
66 be done with a <a href="http://en.wikipedia.org/wiki/Web_browser"
67 target="_top">Web browser</a>. But there are areas where configuration
68 is done using a <a href="http://en.wikipedia.org/wiki/Text_editors"
69 target="_top">text editor</a> to edit configuration files. Also note
70 that the web-based action editor doesn't use authentication and should
71 only be enabled in environments where all clients with access to
72 <span class="APPLICATION">Privoxy</span> listening port can be
76 <h3 class="SECT2"><a name="PROXYMORON" id="PROXYMORON">1.3. What is a
77 <span class="QUOTE">"proxy"</span>? How does Privoxy work?</a></h3>
78 <p>A <a href="http://en.wikipedia.org/wiki/Proxy_server" target=
79 "_top">web proxy</a> is a service, based on a software such as
80 <span class="APPLICATION">Privoxy</span>, that clients (i.e. browsers)
81 can use instead of connecting to web servers directly. The clients then
82 ask the proxy to request objects (web pages, images, movies etc) on
83 their behalf and to forward the data to the clients. It is a
84 <span class="QUOTE">"go-between"</span>. For details, see <a href=
85 "http://en.wikipedia.org/wiki/Proxy_server" target="_top">Wikipedia's
86 proxy definition</a>.</p>
87 <p>There are many reasons to use web proxies, such as security
88 (firewalling), efficiency (caching) and others, and there are any
89 number of proxies to accommodate those needs.</p>
90 <p><span class="APPLICATION">Privoxy</span> is a proxy that is
91 primarily focused on privacy enhancement, ad and junk elimination and
92 freeing the user from restrictions placed on his activities. Sitting
93 between your browser(s) and the Internet, it is in a perfect position
94 to filter outbound personal information that your browser is leaking,
95 as well as inbound junk. It uses a variety of techniques to do this,
96 all of which are under your complete control via the various
97 configuration files and options. Being a proxy also makes it easier to
98 share configurations among multiple browsers and/or users.</p>
101 <h3 class="SECT2"><a name="OTHERSTUFF" id="OTHERSTUFF">1.4. Does
102 Privoxy do anything more than ad blocking?</a></h3>
103 <p>Yes, ad blocking is but one possible use. There are many, many ways
104 <span class="APPLICATION">Privoxy</span> can be used to sanitize and
105 customize web browsing.</p>
108 <h3 class="SECT2"><a name="NEWJB" id="NEWJB">1.5. What is this new
109 version of <span class="QUOTE">"Junkbuster"</span>?</a></h3>
110 <p>A long time ago, there was the <span class="APPLICATION">Internet
111 Junkbuster</span>, by Anonymous Coders and Junkbusters Corporation.
112 This saved many users a lot of pain in the early days of web
113 advertising and user tracking.</p>
114 <p>But the web, its protocols and standards, and with it, the
115 techniques for forcing ads on users, give up autonomy over their
116 browsing, and for tracking them, keeps evolving. Unfortunately, the
117 <span class="APPLICATION">Internet Junkbuster</span> did not. Version
118 2.0.2, published in 1998, was the last official release, available from
119 Junkbusters Corporation. Fortunately, it had been released under the
120 GNU <a href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html"
121 target="_top">GPL</a>, which allowed further development by others.</p>
122 <p>So Stefan Waldherr started maintaining an improved version of the
123 software, to which eventually a number of people contributed patches.
124 It could already replace banners with a transparent image, and had a
125 first version of pop-up killing, but it was still very closely based on
126 the original, with all its limitations, such as the lack of HTTP/1.1
127 support, flexible per-site configuration, or content modification. The
128 last release from this effort was version 2.0.2-10, published in
130 <p>Then, some <a href=
131 "https://www.privoxy.org/user-manual/copyright.html#AUTHORS" target=
132 "_top">developers</a> picked up the thread, and started turning the
133 software inside out, upside down, and then reassembled it, adding many
135 "https://www.privoxy.org/user-manual/introduction.html#FEATURES"
136 target="_top">new features</a> along the way.</p>
137 <p>The result of this is <span class="APPLICATION">Privoxy</span>,
138 whose first stable version, 3.0, was released August, 2002.</p>
139 <p>As of 2012 the Junkbusters Corporation's website
140 (http://www.junkbusters.com/) has been shut down, but Privoxy is still
141 actively maintained.</p>
144 <h3 class="SECT2"><a name="WHYPRIVOXY" id="WHYPRIVOXY">1.6. Why
145 <span class="QUOTE">"Privoxy"</span>? Why change the name from
146 Junkbuster at all?</a></h3>
147 <p>Though outdated, Junkbusters Corporation continued to offer their
148 original version of the <span class="APPLICATION">Internet
149 Junkbuster</span> for a while, so publishing our <span class=
150 "APPLICATION">Junkbuster</span>-derived software under the same name
151 would have led to confusion.</p>
152 <p>There were also potential legal reasons not to use the <span class=
153 "APPLICATION">Junkbuster</span> name, as it was (and maybe still is) a
154 registered trademark of Junkbusters Corporation. There were, however,
155 no objections from Junkbusters Corporation to the <span class=
156 "APPLICATION">Privoxy</span> project itself, and they, in fact, shared
157 our ideals and goals.</p>
158 <p>The Privoxy developers also believed that there were so many
159 improvements over the original code, that it was time to make a clean
160 break from the past and make a name in their own right.</p>
161 <p><span class="APPLICATION">Privoxy</span> is the <span class=
162 "QUOTE">"<span class="emphasis"><i class="EMPHASIS">Privacy Enhancing
163 Proxy</i></span>"</span>. Also, its content modification and junk
164 suppression gives <span class="emphasis"><i class=
165 "EMPHASIS">you</i></span>, the user, more control, more freedom, and
166 allows you to browse your personal and <span class=
167 "QUOTE">"<span class="emphasis"><i class="EMPHASIS">private</i></span>
168 edition"</span> of the web.</p>
171 <h3 class="SECT2"><a name="DIFFERS" id="DIFFERS">1.7. How does Privoxy
172 differ from the old Junkbuster?</a></h3>
173 <p><span class="APPLICATION">Privoxy</span> picks up where <span class=
174 "APPLICATION">Junkbuster</span> left off. <span class=
175 "APPLICATION">Privoxy</span> still blocks ads and banners, still
176 manages <a href="http://en.wikipedia.org/wiki/Browser_cookie" target=
177 "_top">cookies</a>, and still helps protect your privacy. But, most of
178 these features have been enhanced, and many new ones have been added,
179 all in the same vein.</p>
180 <p><span class="APPLICATION">Privoxy</span>'s new features include:</p>
183 <p>Supports "Connection: keep-alive". Outgoing connections can be
184 kept alive independently from the client.</p>
187 <p>Supports IPv6, provided the operating system does so too, and
188 the configure script detects it.</p>
191 <p>Supports tagging which allows to change the behaviour based on
192 client and server headers.</p>
195 <p>Can be run as an "intercepting" proxy, which obviates the need
196 to configure browsers individually.</p>
199 <p>Sophisticated actions and filters for manipulating both server
200 and client headers.</p>
203 <p>Can be chained with other proxies.</p>
206 <p>Integrated browser-based configuration and control utility at
207 <a href="http://config.privoxy.org/" target=
208 "_top">http://config.privoxy.org/</a> (shortcut: <a href=
209 "http://p.p/" target="_top">http://p.p/</a>). Browser-based tracing
210 of rule and filter effects. Remote toggling.</p>
213 <p>Web page filtering (text replacements, removes banners based on
214 size, invisible <span class="QUOTE">"web-bugs"</span> and HTML
215 annoyances, etc.)</p>
218 <p>Modularized configuration that allows for standard settings and
219 user settings to reside in separate files, so that installing
220 updated actions files won't overwrite individual user settings.</p>
223 <p>Support for Perl Compatible Regular Expressions in the
224 configuration files, and a more sophisticated and flexible
225 configuration syntax.</p>
228 <p>GIF de-animation.</p>
231 <p>Bypass many click-tracking scripts (avoids script
235 <p>User-customizable HTML templates for most proxy-generated pages
236 (e.g. "blocked" page).</p>
239 <p>Auto-detection and re-reading of config file changes.</p>
242 <p>Most features are controllable on a per-site or per-location
246 <p>Many smaller new features added, limitations and bugs
252 <h3 class="SECT2"><a name="WHATSANAD" id="WHATSANAD">1.8. How does
253 Privoxy know what is an ad, and what is not?</a></h3>
254 <p><span class="APPLICATION">Privoxy</span>'s approach to blocking ads
256 <p>First, there are certain patterns in the <span class=
257 "emphasis"><i class="EMPHASIS">locations</i></span> (URLs) of banner
258 images. This applies to both the path (you wouldn't guess how many web
259 sites serve their banners from a directory called <span class=
260 "QUOTE">"banners"</span>!) and the host (blocking the big banner
261 hosting services like doublecklick.net already helps a lot).
262 <span class="APPLICATION">Privoxy</span> takes advantage of this fact
263 by using <a href="../user-manual/actions-file.html#AF-PATTERNS" target=
264 "_top">URL patterns</a> to sort out and block the requests for things
265 that sound like they would be ads or banners.</p>
266 <p>Second, banners tend to come in certain <span class=
267 "emphasis"><i class="EMPHASIS">sizes</i></span>. But you can't tell the
268 size of an image by its URL without downloading it, and if you do, it's
269 too late to save bandwidth. Therefore, <span class=
270 "APPLICATION">Privoxy</span> also inspects the HTML sources of web
271 pages while they are loaded, and replaces references to images with
272 standard banner sizes by dummy references, so that your browser doesn't
273 request them anymore in the first place.</p>
274 <p>Both of this involves a certain amount of guesswork and is, of
275 course, freely and readily configurable.</p>
278 <h3 class="SECT2"><a name="MISTAKES" id="MISTAKES">1.9. Can Privoxy
279 make mistakes? This does not sound very scientific.</a></h3>
280 <p>Actually, it's a black art ;-) And yes, it is always possible to
281 have a broad rule accidentally block or change something by mistake.
282 You will almost surely run into such situations at some point. It is
283 tricky writing rules to cover every conceivable possibility, and not
284 occasionally get false positives.</p>
285 <p>But this should not be a big concern since the <span class=
286 "APPLICATION">Privoxy</span> configuration is very flexible, and
287 includes tools to help identify these types of situations so they can
288 be addressed as needed, allowing you to customize your installation.
289 (<a href="trouble.html#BADSITE">See the Troubleshooting section
293 <h3 class="SECT2"><a name="CONFIGORNOT" id="CONFIGORNOT">1.10. Will I
294 have to configure Privoxy before I can use it?</a></h3>
295 <p>That depends on your expectations. The default installation should
296 give you a good starting point, and block <span class=
297 "emphasis"><i class="EMPHASIS">most</i></span> ads and unwanted
298 content, but many of the more advanced features are off by default, and
299 require you to activate them.</p>
300 <p>You do have to set up your browser to use <span class=
301 "APPLICATION">Privoxy</span> (see the <a href=
302 "installation.html#FIRSTSTEP">Installation section below</a>).</p>
303 <p>And you will certainly run into situations where there are false
304 positives, or ads not being blocked that you may not want to see. In
305 these cases, you would certainly benefit by customizing <span class=
306 "APPLICATION">Privoxy's</span> configuration to more closely match your
307 individual situation. And we encourage you to do this. This is where
308 the real power of <span class="APPLICATION">Privoxy</span> lies!</p>
311 <h3 class="SECT2"><a name="LAN" id="LAN">1.11. Can Privoxy run as a
312 server on a network?</a></h3>
313 <p>Yes, <span class="APPLICATION">Privoxy</span> runs as a server
314 already, and can easily be configured to <span class=
315 "QUOTE">"serve"</span> more than one client. See <a href=
316 "configuration.html#LANCONFIG">How can I set up Privoxy to act as a
317 proxy for my LAN</a> below.</p>
320 <h3 class="SECT2"><a name="BROWSERS2" id="BROWSERS2">1.12. My browser
321 does the same things as Privoxy. Why should I use Privoxy at
323 <p>Modern browsers do indeed have <span class="emphasis"><i class=
324 "EMPHASIS">some</i></span> of the same functionality as <span class=
325 "APPLICATION">Privoxy</span>. Maybe this is adequate for you. But
326 <span class="APPLICATION">Privoxy</span> is very versatile and
327 powerful, and can probably do a number of things your browser just
329 <p>In addition, a proxy is good choice if you use multiple browsers, or
330 have a LAN with multiple computers since <span class=
331 "APPLICATION">Privoxy</span> can run as a server application. This way
332 all the configuration is in one place, and you don't have to maintain a
333 similar configuration for possibly many browsers or users.</p>
334 <p>Note, however, that it's recommended to leverage both your browser's
335 and <span class="APPLICATION">Privoxy's</span> privacy enhancing
336 features at the same time. While your browser probably lacks some
337 features <span class="APPLICATION">Privoxy</span> offers, it should
338 also be able to do some things more reliably, for example restricting
339 and suppressing JavaScript.</p>
342 <h3 class="SECT2"><a name="WHYTRUST" id="WHYTRUST">1.13. Why should I
343 trust Privoxy?</a></h3>
344 <p>The most important reason is because you have access to <span class=
345 "emphasis"><i class="EMPHASIS">everything</i></span>, and you can
346 control everything. You can check every line of every configuration
347 file yourself. You can check every last bit of source code should you
348 desire. And even if you can't read code, there should be some comfort
349 in knowing that other people can, and do read it. You can build the
350 software from scratch, if you want, so that you know the executable is
351 clean, and that it is <span class="emphasis"><i class=
352 "EMPHASIS">yours</i></span>. In fact, we encourage this level of
353 scrutiny. It is one reason we use <span class=
354 "APPLICATION">Privoxy</span> ourselves.</p>
357 <h3 class="SECT2"><a name="LICENSE" id="LICENSE">1.14. Is there is a
358 license or fee? What about a warranty? Registration?</a></h3>
359 <p><span class="APPLICATION">Privoxy</span> is free software and
360 licensed under the <a href=
361 "http://www.gnu.org/licenses/old-licenses/gpl-2.0.html" target=
362 "_top">GNU General Public License (GPL) version 2</a>. It is free to
363 use, copy, modify or distribute as you wish under the terms of this
364 license. Please see the <a href="copyright.html">Copyright</a> section
365 for more information on the license and copyright. Or the <tt class=
366 "FILENAME">LICENSE</tt> file that should be included.</p>
367 <p>There is <span class="emphasis"><i class="EMPHASIS">no
368 warranty</i></span> of any kind, expressed, implied or otherwise. That
369 is something that would cost real money ;-) There is no registration
373 <h3 class="SECT2"><a name="SPYWARE" id="SPYWARE">1.15. Can Privoxy
374 remove spyware? Adware? Viruses?</a></h3>
375 <p>No, at least not reliably enough to trust it. <span class=
376 "APPLICATION">Privoxy</span> is not designed to be a malware removal
377 tool and the default configuration doesn't even try to filter out any
379 <p><span class="APPLICATION">Privoxy</span> could help prevent contact
380 from (known) sites that use such tactics with appropriate configuration
381 rules, and thus could conceivably prevent contamination from such
382 sites. However, keeping such a configuration up to date would require a
383 lot of time and effort that would be better spend on keeping your
384 software itself up to date so it doesn't have known
388 <h3 class="SECT2"><a name="OTHERADS" id="OTHERADS">1.16. Can I use
389 Privoxy with other ad-blocking software?</a></h3>
390 <p><span class="APPLICATION">Privoxy</span> should work fine with other
391 proxies and other software in general.</p>
392 <p>But it is probably not necessary to use <span class=
393 "APPLICATION">Privoxy</span> in conjunction with other ad-blocking
394 products, and this could conceivably cause undesirable results. It
395 might be better to choose one software or the other and work a little
396 to tweak its configuration to your liking.</p>
397 <p>Note that this is an advice specific to ad blocking.</p>
400 <h3 class="SECT2"><a name="HELP-THE-DEVELOPERS" id=
401 "HELP-THE-DEVELOPERS">1.17. I would like to help you, what can I
404 <h4 class="SECT3"><a name="PARTICIPATE" id="PARTICIPATE">1.17.1.
405 Would you like to participate?</a></h4>
406 <p>Well, we <span class="emphasis"><i class=
407 "EMPHASIS">always</i></span> need help. There is something for
408 everybody who wants to help us. We welcome new developers, packagers,
409 testers, documentation writers or really anyone with a desire to help
410 in any way. You <span class="emphasis"><i class="EMPHASIS">DO
411 NOT</i></span> need to be a <span class="QUOTE">"programmer"</span>.
412 There are many other tasks available. In fact, the programmers often
413 can't spend as much time programming because of some of the other,
414 more mundane things that need to be done, like checking the Tracker
415 feedback sections or responding to user questions on the mailing
417 <p>So first thing, subscribe to the <a href=
418 "https://lists.privoxy.org/mailman/listinfo/privoxy-users" target=
419 "_top">Privoxy Users</a> or the <a href=
420 "https://lists.privoxy.org/mailman/listinfo/privoxy-devel" target=
421 "_top">Privoxy Developers</a> mailing list, join the discussion, help
422 out other users, provide general feedback or report problems you
424 <p>If you intend to help out with the trackers, you also might want
425 to <a href="https://sourceforge.net/user/registration" target=
426 "_top">get an account on SourceForge.net</a> so we don't confuse you
427 with the other name-less users.</p>
428 <p>We also have a <a href="../developer-manual/index.html" target=
429 "_top">Developer's Manual</a>. While it is partly out of date, it's
430 still worth reading.</p>
432 "http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/TODO?view=markup"
433 target="_top">TODO list</a> may be of interest to you as well. Please
434 let us know if you want to work on one of the items listed.</p>
437 <h4 class="SECT3"><a name="DONATE" id="DONATE">1.17.2. Would you like
439 <p>Donations are welcome. Our <a href=
440 "http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/TODO?view=markup"
441 target="_top">TODO list</a> is rather long and being able to pay one
442 (or more) developers to work on Privoxy would make a huge difference,
443 even if it was only for a couple of weeks. Donations may also be used
444 for Privoxy-related travel expenses (for example to attend
445 conferences), for hardware used for Privoxy development and for
446 hosting expenses etc.</p>
447 <p><span class="APPLICATION">Privoxy</span> is an associated project
448 of <a href="https://www.spi-inc.org/" target="_top">Software in the
449 Public Interest (SPI)</a>, which allows us to receive tax-deductible
450 donations in the United States. You can <a href=
451 "https://www.spi-inc.org/projects/privoxy/" target="_top">donate via
452 Paypal</a> and <a href=
453 "https://co.clickandpledge.com/advanced/default.aspx?wid=34115"
454 target="_top">Click & Pledge</a>. For details, please have a look
455 at <a href="https://www.spi-inc.org/donations" target="_top">SPI's
456 general donation page</a>.</p>
457 <p>You can also donate to Privoxy using a bank account or a "Paypal"
459 <p class="LITERALLAYOUT">
460 Name on account: <a href=
461 "https://www.zwiebelfreunde.de/" target="_top">Zwiebelfreunde
463 IBAN: DE95430609671126825604<br>
464 BIC: GENODEM1GLS<br>
465 Bank: GLS Bank</p>
466 <p class="LITERALLAYOUT">
467 "Paypal" address: privoxy@zwiebelfreunde.de</p>
468 <p>Donations made through Zwiebelfreunde e.V. are tax-deductible in
469 Germany and other countries that recognize German charitable clubs.
470 Feel free to use the Subject field to provide a name to be credited
471 and a list of TODO list items you are interested in the most. For
472 example: Max Mustermann: #16, #1, #14.</p>
473 <p>Note that donations made through Zwiebelfreunde e.V. currently
474 can't be checked automatically so you may not get credited right
475 away. The credits currently reflect donations received before
477 <p>If you have any questions regarding donations please mail to
478 either the public user mailing list or, if it's a private matter, to
479 <a href="mailto:fk@fabiankeil.de" target="_top">Fabian Keil</a>
480 (Privoxy's SPI liaison) directly.</p>
484 <h2 class="SECT2"><a name="SPONSOR" id="SPONSOR">1.18. How can I become
485 a sponsor and get my logo or link on privoxy.org?</a></h2>
486 <p>We are currently offering the following sponsor levels as an
488 <div class="VARIABLELIST">
490 <dt>Gold (10000 EUR/year)</dt>
492 <p>Logo shown at the bottom of the <a href=
493 "https://www.privoxy.org/" target="_top">Privoxy homepage</a>.
494 Logo, link and self description on the <a href=
495 "https://www.privoxy.org/sponsors/" target="_top">sponsor
498 <dt>Silver (1000 EUR/year)</dt>
500 <p>Logo shown randomly at the bottom of the <a href=
501 "https://www.privoxy.org/" target="_top">Privoxy homepage</a>.
502 Logo, link and self description on the <a href=
503 "https://www.privoxy.org/sponsors/" target="_top">sponsor
506 <dt>Bronze (500 EUR/year)</dt>
508 <p>Logo and link on the <a href=
509 "https://www.privoxy.org/sponsors/" target="_top">sponsor
514 <p>The logo sizes depend on the sponsor level. Logos are served from
515 our server, no requests are made to the sponsor website unless the
516 links are being used.</p>
517 <p>The details may change over time but changes will only affect new
518 sponsors (or existing sponsors that explicitly agreed to the
520 <p>If you want to become a sponsor, please contact <a href=
521 "mailto:fk@fabiankeil.de" target="_top">Fabian Keil</a>. New sponsors
522 are only accepted if no developer objects.</p>
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