Anne wants to know how to open a PDF file. All she gets is a blank page. Leo says that she'll have to have a browser that supports PDF, and Internet Explorer doesn't. It needs a helper, like Adobe Acrobat Reader, to read it. Google Chrome and Edge read it natively. Leo recommends downloading a new browser or Acrobat Reader.
Tim needs to print PDFs and add a common black space to custom print text in. Leo says that it's easy to do unless he wants it to automatically increment. If he's doing it manually, it's simple. Any PDF editor can do it. Leo likes PDF Forge. A good PDF tool will also have a rubber stamp signature that can be added. BlueBeam is used by the construction/design industry.
Arnie created a passport photo with a PDF program and now he can't print it unless he pays for it. So he did, but now he can't print anything in PDF unless he uses that PDF maker because it uses Adobe Acrobat. Leo says to get rid of it! He can print directly from preview in the Mac. He'll just need to drag the Adobe app into the trash. He'll also have to look in the startup folder and get rid of the startup files as well. He should search for his root system folder and his account folder. He can even use Spotlight search and look for "Adobe."
Eric wants to be able to lock a PDF file so that nobody can modify it. Leo says that every PDF creator, including Adobe Acrobat, can protect it so it can't be modified. He can also also set the PDF so that the document cannot be forwarded to anyone else. If he trusts the person that he's sending it to, he can encrypt the PDF so it requires a password to open it. But understand that if they can open it, they can make an image of it and share it outside of that. So he'll need to trust the person he sends it to.
Irene downloaded Adobe Reader 11, but when she downloads a PDF, she gets a bunch of editing features and no document. Leo says that sounds like she has the distiller, and not the reader. It works fine on Windows 8, but not on her other machine. Leo says it's maddening and she really shouldn't limp along dealing with it. Leo says that some PDFs may be locked, and she won't be able to open them unless she has a password.