Documents exported as password-protected PDFs are encrypted with the outdated and insecure RC4-128, with no options to use a newer standard (AES)
Steps to Reproduce:
1. File > Export as PDF
2. Security > Set Passwords
4. Open the PDF in a PDF viewer such as Acrobat Reader, and check the Encryption Level
Encrypted with RC4
Encrypted with AES, or at least let the user pick when they export the PDF
User Profile Reset:
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
LibO currently only supports PDF 1.4. Support for 1.6 would need to be added.
For import there is bug 55425
"TODO: in pdf ver 1.5 and 1.6 the step 6 is different, should be implemented. See spec."
Repro LO 6.3+.