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Sometimes it's not the content that you can see that'll get you; it's the content that you can't see. The PDF can contain information that is not immediately visible, like comments, or buttons, or links, even metadata, such as the author or copyright information. There is a lot of information associated with the PDF that's not immediately evident, and often you want to be able to locate that--what is all the hidden information?--so that you can have an opportunity to delete it. I mean somebody might have left in text that is potentially harmful to your business, or that can violate somebody's right to privacy.
So, is there a way to quickly discover all that? Well, yes, there is. That's the point of this video. Open up the PDF and then go to Tools, down to Protection. You want to go all the way down here to Hidden Information. Click Remove Hidden Information, and a little panel opens up on the left that scans through the entire document and then lists all of the hidden information it found. It's a little misleading. It doesn't remove; it first finds it. So it finds the hidden information and then, you can click the Remove button to actually remove it all.
If you want to see what it found, it found metadata, one item, and if we reveal this in the document, what is the metadata, well it found the author. Oh my goodness! The author put her phone number, and the author has her e-mail address in here. I may not really want to post that on the web. It found a comment. Oh I thought we had already gotten rid of all the comments. Where is the comment? Show preview. Where is that? Anne-Marie accidentally pressed the Delete key here when she had the Text Selection tool selected, right.
That's a feature--not a bug--that you can do commenting with the Selection tool, and I forgot to get rid of that. There is hidden text. Where is the hidden text? Show me the preview. Well, apparently on page 3, there is information on how could this be hidden. So, show me the visible text. Show me both hidden and visible. So there is text overlying other text. So some text must have accidentally gotten behind. Let's see where that might be. It was right here. And if we go to the Tools > Content > Edit Object, I bet that somebody moved this.
Let's see if we can get this out of the way here. And look, so you can sort of see somebody dragged it down to cover something up. Maybe that's a way to get some secret information back and forth is that you cover up text with an object. But because we have our handy-dandy Remove Hidden Information panel, we can just delete it all together. So, you can delete individual items on your own, or you can use the Remove Hidden Information to remove everything. It found links. It found cropped content.
It found overlapping objects. Now, before I do this, I want to show you another method that if you really don't care what it finds--you just want to get rid of everything that's hidden, check out this tool. It's really great. It's like an elephant gun. It's called Sanitize Document. Click it and you're going to get an alert that lists everything it searches for and removes. It removes hidden data and metadata from your document, so that sensitive information is not inadvertently passed along. It removes metadata, embedded content, anything if you have attached files--it removes that.
Processing images, I'm not sure why it says, "Merging lines into curves." It always says that. Not quite sure what that's doing. And then it just goes away, and it's done. Apparently all information is gone that was hidden, and if you want, you can go ahead and try Remove Hidden Information to see if it finds anything. No, this document is clean. So, when you want to get rid of hidden information that may be a violation of somebody's privacy, or just contain some information that your recipients don't need to know about that aren't going to raise any bells with their virus protection or anything like that-- you just wanted a plain old PDF-- go to Tools > Protection > Hidden Information.
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