Password Protect PDFs for Legal Documents

Legal documents frequently contain privileged information, personal data, confidential business terms, and financial details. An unencrypted PDF sent by email can be intercepted, forwarded, or accessed by unintended parties. AES encryption raises the barrier significantly. It also demonstrates to clients and counterparties that your firm takes document confidentiality seriously, which is increasingly expected in legal practice.

Draft the document in Google Docs with Restricted sharing to limit access to authorized parties. When ready to distribute, convert to PDF using the Docs to PDF Chrome extension. Apply AES-256 encryption using Adobe Acrobat or PDF24 Desktop. Send the encrypted PDF by email and the password by a separate channel such as a phone call or secure message. Keep a log of which password was sent to which party and when.

AES-256 is the appropriate encryption standard for most legal documents. It is referenced in many law firm information security policies and is the level recommended by bar association technology committees. Avoid older PDF encryption methods such as 40-bit or 128-bit RC4, which are considered weak and may not satisfy modern confidentiality obligations.

Keep a copy of the unencrypted PDF in your own secure document management system. The encrypted copy is for distribution. Store the passwords in your firm's password manager keyed to the matter number and document name. You will need access to historical documents during the matter and for years after, and a lost password is a significant problem.