Sharing PDF files in a Telegram group is easy, but protecting those files is much harder. If you sell courses, CFA study materials, ebooks, training documents, exam preparation materials, reports, or other paid PDFs, you may not want everyone who
How to Stop Users from Sharing Offline PDF Files with a Device-Bound Reading Code
One of the biggest problems with offline PDF protection is file sharing. You send a protected PDF to an authorized user. The user can read it without an Internet connection, which is convenient. However, they may forward the file to