When you use VeryPDF DRM Protector to sell protected PDF eBooks, you can create an authorized user for each customer. For example, if you want each customer to read an eBook on a maximum of 2 devices, you can set
PHP Dynamic Username in PDF DRM Protection with Auto User Creation from URL: Tracking Investor Email Engagement in Real Time
Many developers want to pass a username from PHP into a protected PDF link. The idea is simple: you generate a link dynamically, and the PDF opens with the correct user identity and watermark. But in real projects, things are