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All metadata edits are reversible. While this would normally be considered an advantage, it is a potential security problem because old information is never actually deleted from the file. (However, after running ExifTool the old information may be removed permanently using the "qpdf" utility with
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Since metadata is sometimes not clearly visible in authoring applications (depending on the application and its settings), there is a risk that the user will be unaware of its existence or will forget about it and, if the file is shared, private or confidential information will inadvertently be
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files. They can include information such as details on the file authors, file creation and modification dates, geographical location, document revision history, thumbnail images, and comments. Metadata may be added to files by users, but some metadata is often automatically added to files by
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Metadata removal tools are also commonly used to reduce the overall sizes of files, particularly image files posted on the Web. For example, a small image on a website, which may contain metadata including a
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file, it is important to linearize the PDF file afterwards, otherwise changes are reversible and the metadata can be recovered.
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Server based systems, which are designed to automatically remove metadata at the network gateway.
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exposed. The purpose of metadata removal tools is to minimize the risk of such data leakage.
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authoring applications or by devices used to produce the files, without user intervention.
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Integral metadata removal tools, which are included in some applications, like the
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206:(June 2004). Lawyers’ Professional Indemnity Company. June 2004. Archived from
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The metadata removal tools that exist today can be divided into four groups:
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from files before they are shared with others, e.g., by sending them as
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Batch metadata removal tools, which can process multiple files.
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Digital
Privacy and Security Using Windows: A Practical Guide
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of its users by removing potentially privacy-compromising
233:"A Guardian guide to your metadata – Interactive Graphic"
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256:"Remove metadata from Office files, PDFs, and images"
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Metadata can be found in many types of files such as
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162:Hassan, Nihad; Hijazi, Rami (2 July 2017).
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143:Sanitization (classified information)
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326:This security software article is a
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304:"exiftool Application Documentation"
239:. Elearning Examples. Archived from
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16:Privacy protecting software
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42:or by posting them on the
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30:built to protect the
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213:on 12 December 2022
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371:Categories
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168:. Apress.
149:References
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127:See also
50:Overview
36:metadata
102:add-ins
32:privacy
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211:(PDF)
200:(PDF)
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