LockPDF is described as 'Free online tool to encrypt and lock PDF files. Password protect your PDF's with a strong encryption in just a few seconds. With our easy-to-use online PDF protection tool, simply upload your PDF, set your password, and download the secured PDF ready for sharing' and is an website. There are more than 10 alternatives to LockPDF, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best LockPDF alternative is PDFTK Builder, which is both free and Open Source. Other great sites and apps similar to LockPDF are PDFEncrypt, QPDF, PDFTools and PyPDF2.
Wonderfulshare PDF Protect Pro is an intuitive software solution designed to help you easily secure and encrypt your PDF files. You can protect your PDF files from unauthorized access after you have set owner-password and / or user-password.
Vitrium provides content security solutions and DRM that empower businesses that create, publish, or distribute proprietary, confidential or revenue-generating content. Vitrium protects and controls your videos, documents and images.
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