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Wonderful Adobe Live Cycle Rights Management ES2 presents some controls over sharing information, but a magazine or an ebook publisher is not sharing their information with you so much as showing it to you – just like a newspaper – you buy it to read it, not to copy it into your computer and then do analysis on it or ship it on to friends and family.

http://www.locklizard.com/adobe-livecycle-rights-management.htm

Adobe Rights Management | PDF DRM Enterprise LiveCycle Policy Server Adobe Rights Management provides a policy driven lifecycle enterprise suite DRM solution for PDF files and documents with server based licensing controls.

Our Acrobat security software is designed to stop your files from being viewed, modified, copied or printed by unauthorized parties. With our Acrobat security software you have the ability to control who can view your PDF files and for how long, prevent screen grabs, saving and distribution of your Acrobat files.

http://www.locklizard.com/acrobat_security.htm

Acrobat Security DRM Software | Protecting Adobe Acrobat Documents LockLizard's Acrobat security software provides advanced tools with DRM controls to provide maximum security for protecting your Acrobat PDF documents.

Safeguard PDF Security lets you create secure PDF files that have stronger protection than passwords; cn't be copied or shared with unauthorized users; are locked to specific computers or USB sticks; can't be screen grabbed; can be dynamically watermarked with user details ; can be print controlled; can expire after a number of views, days, prints or at a fixed date; can be revoked at any time, can be restricted to specific IP ranges.
http://www.locklizard.com/secure-pdf-files.htm

How to create secure PDF files and documents with PDF DRM software How to create secure PDF files with DRM controls and encryption. Stop copying, prevent screenshots, control prints. Expire and revoke your secure pdf documents.

To be realistically effective, a PDF lock has to make use of encryption if it is going to prevent anyone from being able to process the PDF without a suitable key. And, of course, just like any other locks, there are different grades of PDF lock.
http://www.locklizard.com/pdf-lock.htm

There are many reasons why you would want to use PDF encryption. If you don't encrypt the PDF file then anyone can read it and the value of your information is lost. But if you are going to encrypt PDF files you need to select a package using a reliable encryption method.
http://www.locklizard.com/pdf-encryption.htm

PDF Encryption Software: Encrypt PDF Files & Documents - LockLizard PDF encryption guide - why you should encrypt pdf documents and files and what you should look for in PDF encryption software.

The core DRM functions in PDF digital rights management are printing, copying/extraction and changing with save. This is because it doesn't matter what kind of publisher you are and what you are trying to achieve, you are going to need these functions whilst the work remains in Copyright.
http://www.locklizard.com/pdf-digital-rights-management.htm

PDF Digital Rights Management for Files & Documents - LockLizard PDF Digital Rights Management - covering the history of rights management pdf, document rights, pdf drm controls and their usage, & pdf drm security software.

With LockLizard's eBook DRM software, you remain in control of your intellectual property, no matter where it resides. If you haven't considered eBooks DRM software before, here are a few reasons to add it to your pre-publishing to do list.
http://www.locklizard.com/ebook_drm.htm

DRM eBook: DRM for ebooks| Protect PDF eBooks with ebook DRM Software Protect your ebooks with LockLizard ebook DRM software protection. Stop unauthorized ebook distribution and secure your revenue stream.