In the protection panel select Encrypt and click 'Encrypt with Password'. Buy PDFelement right now! This would direct you to the task ribbon of Acrobat.
 
 

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Introduction to Acrobat XI; Workspace; Creating PDFs; Editing PDFs; Forms; Combining files; Reviews and commenting; Saving and exporting PDFs; Security. Direct Download Links for Adobe Acrobat XI Pro/Standard + Reader ; Windows – Free Acrobat XI Pro trial in 22 languages ( MB) ; Mac OS – Free.

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Adobe Acrobat XI is available for Windows XP, Windows 7 and Windows 8. It is also available for Mac OS X Snow Leopard or later. Adobe Acrobat XI is the final version of Adobe Acrobat to support Windows XP, Windows Vista (unofficially bypassing installation, version X is the last officially-supported version) and OS X versions Always free, and now more powerful than ever, the Acrobat Reader mobile app is packed with the tools you need to view, annotate, sign, and share PDFs anywhere. And with Acrobat Standard DC, you can do even more. Edit, create, export, . Adobe Acrobat is a family of application software and Web services developed by Adobe Inc. to view, create, manipulate, print and manage Portable Document Format (PDF) files.. The family comprises Acrobat Reader (formerly Reader), Acrobat (formerly Exchange) and replace.me basic Acrobat Reader, available for several desktop and mobile platforms, .