As a NEWBE on encryption and php I want to do the following (I think it should be quite common): Store encrypted pdf documents on my server that are for sale to the people on my database People who purchase the pdf's must be issued with a key or password to download and open the documents they purchased If possible, limit the number of downloads and prints and prevent copying the pdf's Would appreciate your help with a method and way to get this done. Regards. Nick
Hmmm... PDF is an different type of publishing format You need to design your own software to do the jobs you said above There is no Software that will prevent number of copies to print But you Each Time a PDF must be generated in your server if you need to issue different key But the same key can be used to access that same file by different people