How to add Encryption and watermark to an existing pdf document ?
In this case, if you work hard to finish a pamphlet , business planning or electronic books , now , you must expect some tools to help you set security and add watermark to your outcome. Now , WowTron PDF Encryption can help you do this , In order to ensure security level WowTron provides you four levels of security to choose: Standard_Encryption_40_bit , Standard_Encryption_128_bit , AES_128_bit & AES_256_bit ; the AES Encryption is the Advanced Encryption Standard.
In this way , you could add password to pdf (it’s the user password and owner password) to protect your pdf documents . But why there are two passwords in a pdf document ? I will tell you about it ,the user password restrict you to open and read the pdf document and the owner password restrict you to copy , modify , fill or print the pdf document , so it could ensure that your copyright.
Sometimes you also need add watermark or pdf properties (just like the pdf document titile , author , creator , keywords etc) to assert copyright.