Feature: Encryption is not supported in Buffer Mode yet.

[vardhan1122]

this is my nodejs code, please refere once

const HummusRecipe = require('hummus-recipe');
const pdfDataFile = fs.readFileSync('./downloads/Test.pdf');
const pdfDoc = new HummusRecipe(pdfDataFile, 'protectedPdfFile.pdf');
await pdfDoc
.encrypt({
userPassword: '123',
ownerPassword: '123',
userProtectionFlag: 4
})
.endPDF();
await doc.save('./downloads/TestPdfProtected2.pdf');