如果与使用 AES 的 PDF 交互，请参阅安装指南中的说明以安装额外的依赖项。

加密

为 PDF 添加密码（加密）：

from PyPDF2 import PdfReader, PdfWriter

reader = PdfReader("example.pdf")
writer = PdfWriter()

# Add all pages to the writer
for page in reader.pages:
    writer.add_page(page)

# Add a password to the new PDF
writer.encrypt("my-secret-password")

# Save the new PDF to a file
with open("encrypted-pdf.pdf", "wb") as f:
    writer.write(f)

解密

从 PDF 中删除密码（解密）：

from PyPDF2 import PdfReader, PdfWriter

reader = PdfReader("encrypted-pdf.pdf")
writer = PdfWriter()

if reader.is_encrypted:
    reader.decrypt("my-secret-password")

# Add all pages to the writer
for page in reader.pages:
    writer.add_page(page)

# Save the new PDF to a file
with open("decrypted-pdf.pdf", "wb") as f:
    writer.write(f)