encryption tricks to PDF documents so that text can not be copied

hay friends, I will share how to protect pdf fileI used to have thoughts about this, then some of the text on the important files in the form of pdf files can not be copied. when I visited my friend who is good about it ..and he provides several ways for this problemPlease read may be useful: D1) Open your document files, can be a word or excel.
2) Change the document into a PDF file. You can use one of our tips we've published before, namely how to create a PDF file using PrimoPDF and doPDF converts documents using the application. For example, we use doPDF as aplikassi to change the document to a PDF file.
3) After that, open the PDF file that you created earlier using applications such as Adobe Reader PDF Reader, Foxit Reader or SlimPDF Reader. For example, we use the Foxit PDF reader application. Try to block text in the document, then right-click, you can see on the menu there is an option "Copy to Clipboard" which indicates that the document can be copied properly.
4) Furthermore, the application of Foxit Reader, print once again using doPDF (Just like you did in step two, but here print through Foxit reader application). Give a different name the new PDF file can be recognized earlier.
5) Now, try to open a PDF file that you created last. Try using the mouse to copy the text and see, the text can not be copied to the clipboard. PDF file will be read as a JPEG file because it has been through the print page 2 times.
To be more optimal, doing print again using doPDF text reader that really can not be copied to the Clipboard.
Conclusion!
Simply put, this trick will first convert the Word file, Excel or other documents to PDF forms with text can still be copied via the clipboard (Read the text in the PDF). Then, again converted into a PDF file with a text can not be copied (Read as an image file).
PDF file sizes may swell because the last file is read as an image, not as text. At the time of testing, the PDF file (the text can not be copied) has a capacity of nearly 10 times larger than the original PDF file.
This trick does not apply if the person who copied your data using traditional means (do re-type using the keyboard) to do the copy and paste.

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