If you want to protect your PDF files and ensure they can only be opened on a specific hard drive or USB drive, you can use hardware-based DRM. One of the most reliable ways to achieve this is by obtaining
How VeryPDF DRM Protector Secures PDF Files and Enables Controlled Sharing
In today’s digital world, sharing PDF documents as email attachments is still one of the most common ways to exchange important information. However, traditional PDF files—viewed in standard PDF readers like Adobe Acrobat or Foxit—offer little to no real protection