Yes, the Adobe Acrobat Reader mobile app allows you to comment, fill forms, and sign documents. For deeper edits, though, you’ll need a Pro subscription. (Image credit: Adobe) ...

When you try to place a protected PDF into an Adobe InDesign file, a dialog box opens into which you must type the document open password.

Trying to select a large paragraph's worth of text doesn't have to mean clicking and dragging. Click your cursor anywhere in the paragraph, then click two more times in rapid succession.