As I was stalking Pinterest, I ran across this symbol and it freaked me out a little! What this symbol is saying is that people (probably people who are not even teachers) can take the PDFs that we work so hard on, and turn them into an editable document that they can change into whatever they want!
This is why everyone needs to take their time when creating teacher resources. There is a simple fix for this problem. After you create your document, save each of the pages as a picture. I always make mine a high resolution png file so that it is a good quality pic.
I then create another document that I call my 'final' document. I don't want to save over my original file. I may need to go back in and edit something, and you can't do that with the picture. I then put my pictures in for each page.
If you have links that you want people to be able to click, do NOT save them into your picture. I embed my links into little pictures so that they don't get black streaks. Making pics of your pages will also stop the problem that people have with streaks!
I know that most people are honest, and would probably not do anything but change a little thing here or there. However, we all know that there are people out there who take a good thing and use it for evil.
Hope you're having a fab weekend!