Encrypting / Decrypting PDFs

These examples were written in answer to questions such as:

decryptpdf

##GITHUB:https://github.com/itext/i5js-sandbox/blob/master/src/main/java/sandbox/security/EncryptPdf.java##

##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/security/DecryptPdf.cs##

##GITHUB:https://github.com/itext/i5js-sandbox/blob/master/src/main/java/sandbox/security/DecryptPdf.java##

##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/security/DecryptPdf2.cs##

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##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/security/DecryptPdf3.cs##

##GITHUB:https://github.com/itext/i5js-sandbox/blob/master/src/main/java/sandbox/security/DecryptPdf2.java##

##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/security/EncryptPdf.cs##

##GITHUB:https://github.com/itext/i5js-sandbox/blob/master/src/main/java/sandbox/security/DecryptPdf3.java##

##GITHUB:https://github.com/itext/i7ns-samples/blob/develop/itext/itext.samples/itext/samples/sandbox/security/EncryptPdfWithoutUserPassword.cs##