Metadata

In a lot of files, uploaded to indymedia websites, metadata is stored. This wikipage should be a place to diskuss the different types of metadata and provide solutions to remove metadata, to ensure the privacy of media activists.

Filetypes

image/jpeg

Jpeg images often contain [[https://secure.wikimedia.org/wikipedia/en/wiki/Exchangeable_image_file_format] [exif]] data. To remove exif data the program jhead can be used

jhead -purejpg filename.jpg

application/pdf

Pdf files sometimes contain info about the author and the program the pdf was created with. To remove the infos, pdftk can be used

pdftk oldfile.pdf update_info newinfo.txt output newfile.pdf

where newinfo.txt is

InfoKey: Creator
InfoValue:
InfoKey: Title
InfoValue:
InfoKey: Producer
InfoValue:
InfoKey: Author
InfoValue:
InfoKey: CreationDate
InfoValue:

audio/mp3

Mp3 files can contain id3 tags. To remove them, id3v2 can be used:

id3v2 -D file.mp3

video/quicktime

image/jpeg embedded in pdf