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To revoke a PDF document, click Document Revocation. Select the PDF document you want to revoke, click the Add button to add the document to the Revocation List
Permanently remove (redact) visible text and images from PDF documents to protect confidential information. The redaction plugin enables redacted PDFs to be generated directly through Microsoft Word, Excel, and PowerPoint
It's not easy to find a truly free PDF editor that lets you not only edit and add text but also change images, add your own graphics, sign your name, fill out forms, etc. Below, however, is a list of exactly what you're looking for