Watermark On Pdf can add watermarks to all or some pages of a PDF file. If you then secure the document with a password to prevent changes, it can't be removed
This is the recommended security method for files you do not require reviewing. The only thing that is secure is what you want to protect. There is no such thing as one security method, but a combination of precautions to achieve the desired security. You should be able to easily distinguish between a “secure” document, that cannot be re-created, and a “non-secure” document, where it is possible to recreate it. For example, the phrase “I am not responsible” is most often an instruction to write something down or store it. On a non-secure document, it is possible to use an open document editor with an open document format (like Microsoft Word), to change the text and thus change the document. You know this is happening as the information is being stored in plain text, which you know is not secure. You can also download the text as a.