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itext-pdfsweep-java
Remove content from your digital documents irretrievably instead of just covering it up. Redact text, images, parts of images or drawings for complete confidentiality. iText pdfSweep complies with GDPR for data redaction.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The behaviour you want is provided by redaction annotations. These allow you to keep working with the "full" version of the document, and apply the redactions to produce a version without the confidential information. It's a feature in the paid versions of Acrobat and Foxit's PDF viewer, but I'm not aware of any proper, open-source GUI-based tools that can handle that sort of thing. If you're willing to write some code, you can use this: https://github.com/itext/i7j-pdfsweep (it's free as long as you stick to the terms of the AGPL).
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