Creative Commons - User contributions [en]

Exif

2006-08-18T21:42:13Z

Litzker: described structure, et al

[[Category:Developer]]
[[Category:Developer Challenges]]
[[Category:filetype]]
[[Category:example]]
[[Category:metadata]]
[[Category:Exif]]
{{incomplete}}

[http://en.wikipedia.org/wiki/Exif Exchangeable image file format] (official abbreviation Exif, not EXIF) is a specification for the image file metadata format used in audio and image files. However, it is not commonly used in audio and is primarily used by digital cameras to store information such as shutter speed, f-stop, zoom, and so forth. It was created by the Japan Electronic Industry Development Association (JEIDA). The specification uses the existing JPEG, TIFF Rev. 6.0, and RIFF WAVE file formats, with the addition of specific metadata tags. It is not supported in JPEG 2000 or PNG.

Because the Exif 2.1 standard was created in 1998, it is supported by most image viewing or editing software, as well as nearly all digital cameras. Exif data is available in over 30 file formats; consequently, Exif data is a valuable tool for Creative Commons, as it has greater support than certain other recent metadata formats: XMP, for instance.

== Exif Structure ==

Exif data is structured into discrete tags. Each piece of information included in an image has a Tag Name, Field Name, Tag ID, Type, and Count.

''Tag Name'' is an informal description of each tag.

''Field Name'' is a variable name describing the tag, and used by some programs

''Tag ID'' is either a hex or decimal number frequently used to reference a tag

''Type'' can be Byte, ASCII, Short, Long, Rational, Undefined, SLong or SRational, usually abbreviated as a number

''Count'' is the number of values, but not the number of bytes. One Short has a count of 1, despite being 2 bytes

An example of one tag is Image width, whose Field Name is ImageWidth, ID of 0x0100, type of either short or long, and a count of 1.

Of more interest to Creative Commoners is the tag whose Field Name is "Artist", ID 0x013B, type ASCII, and of undetermined length. There are tags for artist, title, copyright, and comments, all of interest to Creative Commons.

Tags are also separated into groups such as Header, IFD0, IFD1, Exif IFD, GPS IFD, or Thumbnail Image Data. Artist, title and copyright information are all in IFD0. Comments are in the Exif IFD.

More information is available in the [http://exif.org/specifications.html Official Exif Specifications]

== Developer Challenges ==

Develop software that embeds and can edit licenses and metadata into this file format. The tag types to use for this are the [http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/XMP.html#dc XMP dc type] and the [http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/XMP.html#cc XMP cc tag type].

Also, one should support the standard Exif metadata tag "Copyright", which is a string would be important as well:

0x8298 Copyright string IFD0

And the Comment type as well:

0x9286 UserComment undef ExifIFD

Exif basic tag types are available here: http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html

=== Implementations ===

There are libraries which manipulate Exif data in most languages - notably [http://pel.sourceforge.net/ PHP]. Some languages only have libraries for reading Exif data, and none to write it.

=== Examples ===

=== Code ===

* Please add yours here :)

==== Sample ====

* Please add yours here :)

=== Mockups ===

* Please add yours here :)

=== TODO ===

* Please help by adding you todo here :)

=== Reference ===

* http://en.wikipedia.org/wiki/Exif
* http://exif.org/specifications.html

Browser Plugin

2006-07-28T14:54:21Z

Litzker: /* Implementations */ greasemonkCC link corrected

[[Category:Technology]]
[[Category:Developer]]
[[Category:Developer Challenges]]
[[Category:Developer Challenges Completed]]
[[Category:web]]
{{incomplete}}

You've probably seen our "some rights reserverd" and "no rights reserved" (for public domain works) buttons on many web pages, but there's more. Whenever a user copies HTML generated by our [http://creativecommons.org/license/ license selection application] they get the button and also a block of metadata describing the licensed work and the license it is offered to the public under. You can't normally see that information without viewing the web page's source. A toolbar or plugin that exploited this hidden information could take many forms. One possibility: If a page has valid license metadata, place a (cc) icon on the toolbar. Mousing over the icon brings up a transient window which displays the [http://creativecommons.org/learn/licenses/ license characteristics] associated with the license and any descriptive metadata also present.

== Mozilla ==

* [[MozCC]]: Extension for [http://mozilla.org Mozilla]-based browsers that adds relevant license characteristic icons to the status bar as you surf and adds a button to the toolbar which allows you to explore associated metadata.
* [http://mycroft.mozdev.org/download.html?name=creativecommons&submitform=Find%20search%20plugins Mycroft CC Search Plugin]: Adds the [http://search.creativecommons.org Creative Commons search engine] to the list available from [http://www.mozilla.org/products/firefox/ Mozilla Firefox's] toolbar. This plugin is bundled with Firefox 1.0. You can [http://www.creativecommons.org/tools/firefox-search-chooser switch between engines in the Firefox search bar].

== Epiphany ==

* [[Epiphany CC Extension]]: Extension for the [http://www.gnome.org/projects/epiphany/ Epiphany] browser that detects embedded license information and adds a CC license icon to the status bar if a license is present.

== All Browsers ==

Too few Creative Commons plugins for other browsers currently exist. We [http://www.creativecommons.org/technology/challenges#challenge_entry_3848 invite you] to write one. However, these sites will be useful with any browser:

* [http://thewebdesignjournal.com/services/browser-panels/ CC Search Browser Panel]: Adds a panel / sidebar for the [http://search.creativecommons.org/ Creative Commons search engine] to any modern Web browser. Such as [http://opera.com/ Opera], [http://getfirefox.com/ Firefox], [http://browser.netscape.com/ Netscape] and others. More [http://thewebdesignjournal.com/services/browser-panels/help/ info on panels].</li>
* [http://search.creativecommons.org Creative Commons Search Engine]: Allows you to search the web for works that match your licensing and media requirements, mirroring the options available from our [http://www.creativecommons.org/license/ license chooser].
* [http://yergler.net/projects/ccvalidator/ ccValidator]: Inspects and displays license metadata associated with any page.

== Implementations ==

* Nathan Yergler has created [http://www.yergler.net/projects/mozcc/ mozCC], a browser extension for Mozilla-based browsers. It's a start, but we know there are other browser in use.
* Robert Litzke has written [http://www.ug.cs.sunysb.edu/~litzker/scripts/greasemonkCC.user.js greasemonkCC], a Greasemonkey script for all Greasemonkey-enabled browsers. It displays a customizable bar at the top of Creative Commons-tagged pages. GreasemonkCC requires the [https://addons.mozilla.org/firefox/748/ Greasemonkey] extension for Mozilla browsers. Internet Explorer requires a plugin, [http://www.reifysoft.com/turnabout.php Turnabout], for instance, to run Greasemonkey.
* Jaime Frutos Morales has created [http://textoplano.livejournal.com/1679.html Creative Commons license viewer], an extension for the Epiphany browser. You can download it from [http://www.geocities.com/textoplano/cc-license-viewer.tar.gz here].
* So how about similar plugins for IE, Safari, Opera, Konqueror or something else?
* Please add your implementation here :)

== Examples ==

* Please add you example, screenshot, mockup, etc here :)

== TODO ==

* Please add your TODO here :)

Browser Plugin

2006-05-24T15:05:22Z

Litzker: /* Implementations */

[[Category:Technology]]
[[Category:Developer]]
[[Category:Developer Challenges]]
[[Category:Developer Challenges Completed]]
[[Category:web]]
{{incomplete}}

You've probably seen our "some rights reserverd" and "no rights reserved" (for public domain works) buttons on many web pages, but there's more. Whenever a user copies HTML generated by our [http://creativecommons.org/license/ license selection application] they get the button and also a block of metadata describing the licensed work and the license it is offered to the public under. You can't normally see that information without viewing the web page's source. A toolbar or plugin that exploited this hidden information could take many forms. One possibility: If a page has valid license metadata, place a (cc) icon on the toolbar. Mousing over the icon brings up a transient window which displays the [http://creativecommons.org/learn/licenses/ license characteristics] associated with the license and any descriptive metadata also present.

== Mozilla ==

* [http://www.yergler.net/projects/mozcc/ mozCC]: Extension for [http://mozilla.org Mozilla]-based browsers that adds relevant license characteristic icons to the status bar as you surf and adds a button to the toolbar which allows you to explore associated metadata.
* [http://mycroft.mozdev.org/download.html?name=creativecommons&submitform=Find%20search%20plugins Mycroft CC Search Plugin]: Adds the [http://search.creativecommons.org Creative Commons search engine] to the list available from [http://www.mozilla.org/products/firefox/ Mozilla Firefox's] toolbar. This plugin is bundled with Firefox 1.0. You can [http://www.creativecommons.org/tools/firefox-search-chooser switch between engines in the Firefox search bar].

== All Browsers ==

Too few Creative Commons plugins for other browsers currently exist. We [http://www.creativecommons.org/technology/challenges#challenge_entry_3848 invite you] to write one. However, these sites will be useful with any browser:

* [http://thewebdesignjournal.com/services/browser-panels/ CC Search Browser Panel]: Adds a panel / sidebar for the [http://search.creativecommons.org/ Creative Commons search engine] to any modern Web browser. Such as [http://opera.com/ Opera], [http://getfirefox.com/ Firefox], [http://browser.netscape.com/ Netscape] and others. More [http://thewebdesignjournal.com/services/browser-panels/help/ info on panels].</li>
* [http://search.creativecommons.org Creative Commons Search Engine]: Allows you to search the web for works that match your licensing and media requirements, mirroring the options available from our [http://www.creativecommons.org/license/ license chooser].
* [http://yergler.net/projects/ccvalidator/ ccValidator]: Inspects and displays license metadata associated with any page.

== Implementations ==

* Nathan Yergler has created [http://www.yergler.net/projects/mozcc/ mozCC], a browser extension for Mozilla-based browsers. It's a start, but we know there are other browser in use.
* Robert Litzke has written [http://www.litzke.com/scripts/greasemonkCC.user.js greasemonkCC], a Greasemonkey script for all Greasemonkey-enabled browsers. It displays a customizable bar at the top of Creative Commons-tagged pages. GreasemonkCC requires the [https://addons.mozilla.org/firefox/748/ Greasemonkey] extension for Mozilla browsers. Internet Explorer requires a plugin, [http://www.reifysoft.com/turnabout.php Turnabout], for instance, to run Greasemonkey.
* So how about similar plugins for IE, Safari, Opera, Konqueror, Epiphany or something else?
* Please add your implementation here :)

== Examples ==

* Please add you example, screenshot, mockup, etc here :)

== TODO ==

* Please add your TODO here :)